###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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# Area and Perimeter of Rectangles - Concept

Alissa Fong
###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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The area of any parallelogram is the length of the base times the length of the height, where the base and height must be perpendicular. This is easy to apply to rectangles and squares because the sides are perpendicular- area equals base times height (or length times width, if you'd rather- the key is that they're perpendicular.) As for any shape, the perimeter is equal to the sum of all of the sides.

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