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Lesson 7 · Perimeter and Area

Circumference and Area of a Circle

MathematicsSubject

14 minEstimated read

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Lesson 7 topics

Perimeter and Area Circumference and Area of a Circle

Quick Facts

Lesson: 7: Perimeter and Area
Topic: Circumference and Area of a Circle
Domain: Geometry

A = pi r squared. It comes from cutting a circle into sectors and rearranging them into a rectangle of height r and length pi r.

Study Tip

Halve the diameter before you start, and square the radius before you touch pi. Then check: a circle always fills a little over three quarters of the square around it.