Question

How to do this question plz.

plz work out for me in your notebook or sheet if you can plz the question ​so I can understand more plzz

Answer 1

`3\pi`

Explanation:

The circumference of a circle is
`2\pi r`.

If we want to find the circumference of this semi-circle, we can find the circumference if it was a whole circle then divide by 2.

`2 \cdot \pi \cdot r\\2 \cdot \pi \cdot 3\\6 \cdot \pi\\ 6\pi`

Now we know the circumference of the whole circle.

To find the circumference of half the circle we divide by 2.

`6\pi / 2 = 3\pi`

Hope this helped!