Question

Find the arc length of the semicircle.

Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi and enter your answer as a decimal.

Answer 1

It is 9 pi

Explanation:

Answer 2

The value of the arc length of the semicircle in terms of π is 4.5 π

Explanation:

In this question, we are asked to find the arc length of the semicircle.

For a full circle, the formula for the circumference is πD or more generally 2 π r

The first will suit this calculation better as we have the value for the diameter already which is 9.

Now, the value of the circumference will be half that of a full circle since we are dealing with a semicircle.

Thus, our formula become πD/2 or simply πr

Now, substituting the value of our diameter, we will have

Circumference = π * 9/2 = π * 4.5 = 4.5 π