Question

Which is greater, the circumference of a circle with radius 3 ft, or the distance around a semicircle with diameter 16 A? By how much? circle, by 40 ft circle, by 2n ft semicircle, by 40 ft Od semicircle, by 21 ft​

Answer 1

Option C

Explanation:

Circumference of a circle =
`2\pi r`

Circumference of a circle with radius 3 ft=
`2\pi *3 = 6\pi`

Circumference of a circle with radius 8 ft or 16 ft=
`2\pi *8/2 = 16\pi/2 = 8\pi`

The difference between the two circle

`8 \pi - 6\pi = 2\pi \\= 2 * 3.14\\= 6.28\\`

Hence, option C is correct