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## Algebra basics (ASL)

### Course: Algebra basics (ASL) > Unit 1

Lesson 10: Circumference and area of circles (ASL)# Area of a circle

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter. Created by Sal Khan and Monterey Institute for Technology and Education.

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