3 years ago

Find the area of a circle with a radius of 21 inches.

Mathematics

2 answers:

tiny-mole [99]3 years ago

8 0

Answer:

1384.74 inches.

Step-by-step explanation:

The formula for area of a circle is:

$a=\pi *r^2(3.14*radius*radius)$

$\pi =3.14, r=radius.$

According to the word problem, the radius of the circle is 21 inches.

Now, we can just plug the numbers into the formula.

$\pi *21^2(3.14*21*21)=1384.74$

Therefore, the area of the circle is 1384.74 inches.

Alex3 years ago

3 0

Answer:

A≈1385.44in²

Step-by-step explanation:

A=πr2=π·212≈1385.44236in²

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