Question

find the area of a semi circle whose circumference is 18m

Answer 1

formula:
areA of semicircle= (pi r^2)/2
circumference of semicircle=(2 pi r)/2 + 2r
apply this to get answer

Answer 2

circumference of semi circle=Πr
18m=22/7r
18×7/22=r
r=5.72 approx.
Area of semicircle=1/2Πr²
1/2×22/7×5.72²
51.41m²approx