Lesson 8. Perimeter and Area. Perimeter. The perimeter of a closed figure is the distance around the outside of the figure. In the case of a polygon, the perimeter is found by adding the lengths of all of its sides. No special formulas are needed.
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Perimeter and Area
hAltitudes of Triangles
where b is the length of the base (one of the sides of the triangle) and h is the height (the length of the altitude drawn to the base).
bArea of a Parallelogram
BArea of a Trapezoid
where s is the semiperimeter: