points on the same line

on the same plane

a part of a line with two endpoints

a part of a line with one endpoint

a point that divides a line segment into two equal segments

a line or ray that divides an angle into two congruent angles

an angle that measures less than ninety degrees

an angle that measures more than 90 degrees but less than 180 degrees

an angle that measures exactly 180 degrees

an angle that measures exactly 90 degrees

two angles whose sum is 90 degrees

two angles whose sum is 180 degrees

lines in a plane which do not intersect

lines that meet to form right angles

the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides

two segments that have the same length

two angles that have the same measure

a triangle with two congruent sides

a triangle with three congruent sides

a triangle with three sides of different measures