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At a Glance - Three-Sided Shapes

 

We call a three-sided shape a triangle. You know these guys; they've gotten pretty famous thanks to pizza.

The perimeter of a triangle is the sum of its three sides. The area A of a triangle is given by this formula:

This formula is the way it is because the triangle fills exactly half of a rectangle with side lengths b and h, as shown below.

 

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