What do you call a polygon with 3 sides and 3 angles?

How many diagonals does a triangle have?

Which of the following is a three-sided polygon?

What polygon has 4 sides and 4 angles?

Is a square a rectangle?

Which of the following is a four-sided polygon?

Is a square is always a rhombus?

Is a rhombus a trapezoid?

What kind of quadrilateral has 4 equal sides and 4 right angles?

What kind of quadrilateral has only one pair of parallel sides?