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Explain why you can use πr2 to find the area of the base of a cone
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Explain why you can use πr2 to find the area of the base of a cone

User Yasin Yousif
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The base of a cone is a circle.

The area of a circle is
\pi r^2.

Thus, the area of the base of a cone
\pi r^2.

The derivation of the formula for the area of a circle involves a bit of calculus, but if you'd like, I can walk you through it.
User Ben Hughes
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