What is the exact area of a circle having diameter 4 in.?
2 answers:
R = d/2 = 4/2 = 2 in
A = π r^2 = π (2)^2 = 4<span>π
answer
</span>4<span>π in^2</span>
The exact area is 12.56 in.
First, consider the formula for the area of a circle, which is A=πr². The radius is half of the diameter, so if the diameter is 4 the radius is 2.
A=πr²
A=π2²
A=π4
A=3.14*4
A=12.56
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