Rectangles Discovery Activity

Topic:
Rectangle

Definition of a rectangle

A rectangle is an equiangular parallelogram.

What is the measure of each angle in a rectangle?

Select all that apply
  • A
  • B
  • C
  • D
Check my answer (3)
Since a rectangle is a parallelogram, it has all of the properties of a parallelogram:
  • opposite sides are parallel
  • opposite sides are congruent
  • opposite angles are congruent
  • consecutive interior angles are supplementary
  • diagonals bisect each other
There is one additional property of a rectangle that involves the diagonals.

Make a conjecture about the diagonals of a rectangle. Test your conjecture by moving around points A, B, and C in rectangle ABDC below.

Type your conjecture here.

What could we do to decide whether quadrilateral ABCD is a parallelogram? a rectangle?

What could we do to decide whether quadrilateral ABCD is a parallelogram?  a rectangle?

How would you show whether quadrilateral ABCD above is a parallelogram?

How would you show whether quadrilateral ABCD above is a rectangle?