Rectangles

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Definition- A rectangle is a quadrilateral with four right angles.

Theorems 8.13 and 8.14

For example, you're making a window frame, it's important to be sure that it is a rectangle, otherwise moisture can leak through the cracks. You know that the opposite sides are congruent. That shows that it is a parallelogram. To make sure that the parallelogram is a rectangle, measure the red lines and make sure that they are congruent. You're building a house. Beam AD is 12 feet long, and BC is 12 feet long. AB is 8 feet long, and DC is four feet less than BC. If AC is twice the length of 3/4 BC, can you find what BD is? And if so, how long is BD? Property #4 3 sample problems