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OpenStudy (anonymous):
Suppose the diameter of a circle is 4. What is its area?
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hero (hero):
The diameter is twice the radius. In other words, d = 2r. Therefore, r = 2. Use \[\text{Use} \space A = \pi r^2 \space \text {and solve.}\]
OpenStudy (anonymous):
A=3,14*4; A=12,56
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