Answers:
a. 38.4895 cm^2
b. 190.091 cm^2
a. solution,
radius(r)=7 cm
Area of quarter circle= pi (r)^2/4
= 3.142*(7)^2/4
= 3.142*49/4
=38.4895 cm^2
b. Solution,
radius=11 cm
area of semicircle=1/2*pi*(r)^2
=1/2*3.142*(11)^2
=1/2*3.142*121
=190.091 cm^2
Hope it helps
Good luck on your assignment