Question

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

Answer 1

Answer:

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

$\frac{2\pi r}{2} + 2r$

Now, we can replace r by 22:

$\frac{2\pi *22}{2} + 2*22 \approx 113.12$

So the perimeter is approximately 113.12 cm