Quadrilateral ABCD with Parallel Sides: Rectangle Classification Problem

Question

Given the quadrilateral ABCD whereby

AD||BC , AB||CD

Indicate if the quadrilateral is a rectangle.

00:00 Is the quadrilateral ABCD a rectangle?

00:03 In a rectangle all angles are right angles, angle B is not a right angle

00:06 Therefore the quadrilateral is not a rectangle and this is the solution to the question

In a rectangle, it is known that all angles measure 90 degrees.

Since we know that angle B is equal to 100 degrees, the quadrilateral cannot be a rectangle.