Question

write the perimeter of a semi circle of radius ( r )​

Answer 1

Answer:π× r

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

Perimeter of circle is circumference of circle.

Circumference of circle = 2πr

Circumference of semi-circle:

But If you are going to walk around a semicircle you need to go half way around the circle and then across a diagonal to get back to where you started so the perimeter is 2πr/2+d = πr+2r.