ACT 2019 April(Z15) Math Question 19 Explanation - ACT Helper

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2019 April(Z15) Math Question 19
Perimeter, Area, Volume
- Triangles, Squares, Rectangles, Circles
Choice E
$C i r c u m f e r e n c e = π \times d i a m e t e r = 2 \times π \times r a d i u s .$ $2 π r = 12 π$ $\Rightarrow r = 6$ $A r e a = π r^{2} = π 6^{2} = 36 π$
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