What is the area of a circle that has a circumference of 42 inches? A. 140.4 in2 B. 126.60 in2 C. 132.62 in2 D. 21.04 in2

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asked Aug 21, 2019 118k views

3 votes

What is the area of a circle that has a circumference of 42 inches? A. 140.4 in2 B. 126.60 in2 C. 132.62 in2 D. 21.04 in2

Mathematics
high-school

Ryan Heaton asked

by Ryan Heaton

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1 Answer

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Circumference = 2
$\pi$ r
42 = 2
$\pi$ r
42/(2
$\pi$ ) = r
21/
$\pi$ = r

Area =
$\pi$ r²
=
$\pi$ (21/
$\pi$ )²
= 21²/
$\pi$
= 140.37
≈ 140.4

Answer: A

Jhenninger answered Aug 28, 2019

by Jhenninger

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