Question

find the perimeter of the semicircle figure

Answer 1

Please mention diagram also
Neither you can also type but next time, hope you will write whole question.
By the ways if you want formula then
Perimeter or circumference of a circle =2 pie *r
And
Area of circle =
Pie *r square

Answer 2

perimeter of circle =2×pie×r
so semicircle is half of circle
so perimeter of semicircle = pie×r