A round plane figure whose boundary consists of points equidistant from the center.

The point inside a circle that is the same distance from every point on the circle.

A straight line from the center to the circumference of a circle or sphere.

A straight line passing from side to side through the center of a circle or sphere.

A segment whose endpoints lie on a circle

A line that intersects a circle at two points

A line that is in the same plane as a circle and intersects the circle at exactly one point

An angle whose vertex is the center of a circle.

An arc of a circle whose points are on or in the interior of a central angle.

An arc of a circle whose points are on or in the exterior of a central angle

An arc of a circle whose endpoints lie on a diameter.

The measure of a minor arc's central angle.

The difference between 360 degrees and the measure of the related minor arc.

Two circles that have congruent radii.

Two arcs that are in the same or congruent circles and have the same measure

An angle whose vertex is on the circle and whose sides contain chords of the circle

An arc that consists of endpoints that lie on the sides of an inscribed angle and all the points of the circle between the endpoints

A polygon whose vertices all lie on a circle.

A circle is circumscribed about a polygon if each vertex of the polygon lies on the circle.

The segments formed from two chords that intersect in the interior of a circle.

A segment of a secant line that has exactly one endpoint on the circle.

The part of a secant segment that is not inside the circle.

A circle with radius (r) and center (h,k) had this standard equation: (x-h)2 + (y-k)2 = r2

The new figure after a transformation

The original figure before a transformation

A transformation that preserves shape and size

A quantity that has magnitude and direction.

The starting point of a vector.

The endpoint of a vector.

The horizontal change from the initial point to the terminal point of a vector.

The vertical change from the starting point of a vector to the ending point.

Combines the horizontal and vertical components.

A rectangular arrangement of numbers.

Each numbers in a matrix.

A measurable extent of a particular kind, such as length, breadth, depth, or height.

A line that a figure is flipped across to create a mirror image of the original figure.

A fixed point around which shapes move in a circular motion to a new position.

Angle formed by rays drawn from the center of rotation to a point and its image.

A transformation involving a translation followed by a reflection.

When two or more transformations are combined to form a single transformation.

One half of a figure is a mirror image of the other half.

The line that divides two matching parts. It can be vertical, horizontal, or diagonal.

When the figure can be mapped onto itself by a rotation of 180 degrees.

The center of rotation in a figure that has rotational symmetry.

Multiply each element in the matrix by the scalar.

A segment that joins two nonconsecutive vertices in a polygon

A quadrilateral with both pairs of opposite side parallel

A quadrilateral with congruent sides and congruent opposite angles`

A quadrilateral with all right angles and opposite angles are congruent

A quadrilateral with exactly one pair of parallel sides, which are the bases

A quadrilateral with 4 right angles and all sides congruent

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A set of three positive integers a, b, and c that satisfy the a² + b² = c²

A ratio of the lengths of two sides in a right triangle.

Ratio of the opposite to the adjacent side of a right-angled triangle

Ratio of the opposite side to the hypotenuse of a right-angled triangle

Ratio of the adjacent side to the hypotenuse of a right-angled triangle

The angle formed by a horizontal line and the line of sight to an object above the horizontal line.

The angle formed by a horizontal line and the line of sight to an object below the horizontal line.

To find the measures of all of the sides and angles of a right triangle

An inverse trigonometric ratio, abbreviated as tan -1.

An inverse trigonometric ratio, abbreviated as sin -1.

An inverse trigonometric ratio, abbreviated as cos -1.

A comparison if two numbers using division.

An equation that states that two ratios are equal.

middle terms of the proportion

First and last numbers in a proportion.

Number that when substituted for X will make a porportion true.

Represents an object as smaller than or larger than its actual size.

Specify a percentage of original size to enlarge or reduce the size of an object..

Polygons that have the same shape.

The ratio of the lengths of two corresponding sides of two similar polygons.

A transformation that stretches or shrinks a figure to create a similar figure.

The fixed point about which the figure is enlarges or reduced

The ratio/amount by which the image grows or shrinks in a dilation.

A dilation with a scale factor between 0 and 1

a dilation with a scale factor greater than 1

A segment with endpoints that are the midpoints of two sides of the triangle

A proof involving placing geometric figures in a coordinate plane.

At the same distance.

A segment that is perpendicular to the a segment and makes two congruent segments

Happening at the same time; parallel

The point where concurrent lines intersect.

The point of concurrency of the perpendicular bisectors of a triangle.

The point of concurrency of the angle bisectors of a triangle.

A segment from a vertex to the midpoint of the opposite side.

The point of concurrency of the medians of a triangle.

a segment that extends from a vertex and is perpendicular to the other side

Point of concurrency of the altitudes of a triangle.

A proof involving indirect reasoning.

A polygon with three sides.

A triangle with no congruent sides.

A triangle with at least two congruent sides.

A triangle with three congruent sides.

A triangle with three acute angles.

A triangle with exactly one right angle.

A triangle with exactly one obtuse angle.

A triangle where all three angles are congruent.

Angles on the inside of parallel lines cut by a transversal.

Angles on the outside of parallel lines cut by a transversal.

A direct or natural consequence or result.

All the parts of one figure are congruent to the corresponding parts of the other figure.

The parts of congruent figures that match.

The sides adjacent to the right angle

The side opposite the right angle

A proof using arrows to show the flow of a logical argument.

The two congruent sides of an isosceles triangle.

The angle formed by the legs of an isosceles triangle.

The side of an isosceles triangle that is not congruent.

The two angles adjacent to the base.

An operation that moves or changes a geometric figure in some way to produce a new figure.

A transformation that moves every point of a figure the same distance in the same direction.

A transformation that uses a line of reflection to create a mirror image of the original figure.

A transformation that turns a figure about a fixed point, called the center of rotation.

Lines in the same plane that never intersect.

Lines that do not intersect and are not in the same plane.

Planes that never intersect.

A line that intersects two or more coplanar lines at different points.

Angles that are in the same position on the parallel lines with respect to the transversal.

Angles that are on opposite sides of the transversal and inside the parallel lines.

Angles that are on opposite sides of the transversal and outside the parallel lines.

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The length of the perpendicular segment from the point to the line.

An unproven statement that is based on observations.

Finding a pattern in specific cases and writing a conjecture for the general case.

A specific case for which a conjecture is false.

A logical statement that has two parts, a hypothesis and a conclusion.

A statement written by exchanging the hypothesis and conclusion of a conditional statement

A statement written by negating both the hypothesis and conclusion.

A statement written by taking the converse and negating both the hypothesis and conclusion.

A conditional statement, where the "if" part contains the hypothesis and the "then part contains the conclusion.

A testable prediction, often implied by a theory.

A summary based on evidence or facts.

The opposite of the original statement

Two statements that are both true or both false

Two lines that intersect to form a right angle

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A statement where the conditional statement and its converse are both true.

The use of facts, definitions, accepted properties, and the laws of logic, to form a logical argument.

A line that is perpendicular to a given line and a given point on that line.

A logical argument that shows a statement is true.

Numbered statements and corresponding reasons that show an argument in a logical order.

A statement that can be proven.

Point, line, and plane; only explained using examples and descriptions.

Has no dimension. Represented by a dot.

Has one dimension. It is represented by any 2 points with arrow over the points.

A two-dimensional flat surface that extends in all directions.

Points that lie on the same line.

Points that lie on the same plane.

Terms that can be described using known words such as point or line.

A piece of a line with two endpoints

Points that mark the ends of a line segment or end of a ray.

A part of a line with one endpoint and a line going on forever in the other direction.

Have the same endpoint, move in opposite directions, and are on the same line.

The point or set of points in common to two figures.

Something accepted as true without proof; an axiom.

Self-evident truth requiring no proof; universally or generally accepted principle.

Number that corresponds to a point.

The length of a path between two points.

In the middle of two things.

Segments that have the same length.

Point of a segment that divides a segment into two congruent segments.

Any segment, line, line segment, or plane that intersects a segment at its midpoint.

Formed by two rays with a common endpoint.

The Rays of an angle.

The shared endpoint of the 2 rays/line segments that make up an angle

The size of an angle. Angles can be measured in degrees (°) or radians.

An angle whose measure is less than 90 degrees and greater than 0 degrees.

An angle whose measure is exactly 90 degrees.

An angle whose measure is greater than 90 degrees and less than 180 degrees.

An angle that is exactly 180 degrees, a straight line.

Angles with the same measure.

A ray that divides an angle into 2 congruent angles.

A geometric drawing that uses a limited set of tools, usually a compass and straightedge.

Two angles whose measures add up to 90 degrees.

Two angles whose measures add up to 180 degrees.

Two coplanar angles with the same vertex and are on the same side, but different interior points.

Adjacent supplementary angles that form a straight line.

Two angles whose sides are opposite rays.

Closed plane figure formed by 3+ sides.

Each segment that forms a polygon.

The common endpoint of two sides.

Curved outward.

Curved inward

Used to name a polygon with "n" number of sides i.e. a polygon with 14 sides is a 14-gon.

All sides are congruent.

All interior angles of this polygon are congruent

A convex polygon that is equilateral and equiangular.