Question

asked Mar 1, 2020 149k views

2 Answers

Eemilk · Answer 1 · 2020-03-01T19:41:33+0000

Answer:

C ≈ 29.52 in

Explanation:

The formula of a circumference of a circle:

$C=2\pi r$

r - radius

The formula of an area of a circle:

$A=\pi r^2$

We have r = 4.7 in.

Substitute:

$C=2\pi(4.7)=9.4\pi\ in$

$\pi\approx3.14\to C\approx(9.4)(3.14)=29.516\ in\approx29.52\ in$

$A=\pi(4.7)^2=22.09\pi\ in^2$

$\pi\approx3.14\to A\approx(22.09)(3.14)=69.3626\ in^2\approx69.36\ in^2$

Mrc · Answer 2 · 2020-03-06T16:38:52+0000

Step-by-step explanation: To find the area of a circle, start with the formula for the area of a circle.

$Area = \pi r^(2)$

Since the radius of the circle is 4.7 inches, we can plug 4.7 in for the radius in our formula.

$Area = (\pi) (4.7 in.)^(2)$

Remember that 4.7 in.² is equal to 4.7 inches × 4.7 inches or 22.09 in.².

$Area = 22.09\pi in.^(2)$

Now, remember that pi is approximately equal to 22/7 or 3.14. This means that we can estimate the area of the circle by plugging in 3.14 for pi.

Area = (22.09) (3.14)

Area = 69.36 in.²

Now, let's find the circumference of the circle. To find the circumference of a circle, start with the formula for the circumference.

Circumference = 2πr

Notice that our radius is 4.7 inches which means we can plug in 4.7 inches for the radius in our formula.

Circumference = (2) (π) (4.7 in)

Circumference = 9.4π inches