Question

Find perimeter of semicircle if radius is 22 cm (π=22/7)​

Answer 1

To calculate the perimeter of a circle we have this formula:

`P = 2\pi r`

And, if we're going to calculate for a semicircle, we should divide it by 2

We should also take into account the diameter, as, if it's a semicircle, we also have to add the base of it, which will have the diameter length

Knowing this, we can see the formula to calculate this specific perimeter

`(2\pi r)/(2) + 2r`

Now, we can replace r by 22:

`(2\pi *22)/(2) + 2*22 \approx 113.12`

So the perimeter is approximately 113.12 cm