Question

Find the circumference of the circle in terms of pi.

A. 39 in
B. 1521 in.
C. 78 in
D. 156 in

Answer 1

Option C is correct

78 π inches

Explanation:

Circumference (C) of a circle is given by:

`C = 2 \pi r` .....[1]

where, r is the radius of the circle.

As per the statement:

From the given figure;

radius of the circle(r) = 39 in.

Substitute this value in [1] we have;

`C = 2 \cdot \pi \cdot 39 = 78 \pi`

Therefore, the value of circumference of the circle in terms of pi is,
`78 \pi in.`

Answer 2

The circumference of the circle with radius
`r` is given by
`P=2\pi r`. When
`r=39\;in`,

`image`

Correct choice is (C).