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Using circumference to find a circle's area

Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.

Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone.

https://schoolyourself.org/page/lti/sy/geometry/circle-area

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