Question

Why are you plus perimeter of tha semi circle and daimeter

Answer 1

the perimeter of a semicircle is half the circumference + all the diameter so pi*r+2r or r(pi+2). ... The perimeter of a circle is called circumference. Circumference of a circle is equal to 2 π r , here is radius and is a mathematical constant which is defined as the ratio of a circle's circumference to its diameter.

Answer 2

perimeter of a circle is equal to circumference
and diameter is equal to 2r
and perimeter of semi circle is half of circumference