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How do you find the area of a circle with diameter 20in?

1 Answer

Apr 29, 2018

$area = 100 π \approx 314.2 {in}^{2} to 1 dec. place$ $"area "=100pi~~314.2" in"^2" to 1 dec. place"$

Explanation:

$using the formula for area (A) of a circle$ $"using the formula for area (A) of a circle"$

$∙ x A = π r^{2} \leftarrow r is the radius$ $•color(white)(x)A=pir^2larrcolor(blue)"r is the radius"$

$here diameter = 20 \Rightarrow r = \frac{20}{2} = 10 in$ $"here diameter "=20rArrr=20/2=10" in"$

$\Rightarrow A = π \times 10^{2} = 100 π \approx 314.2$ $rArrA=pixx10^2=100pi~~314.2$

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