Question

Consider the following when r = 8cm. Give both exact values and approximations to the nearest hundreth.

Answer 1

16π cm ≈ 50.27 cm

64π cm ≈ 201.06 cm

Explanation:

Circumference formula is Diameter × π

To find diameter we just multiply the radius by 2

8x2=16

Now we fill it into the formula to find exact

16π cm

And now to find approximate we put this in a calculator to get

50.27 cm

Circle area formula is pi x radius square

First find the square of the radius or 8

8^2= 64

Now put this next to pi for exact

64π

Now put this into calculator for approximate

201.06

Hope this helps