Answer:
D
Explanation:
surface of the semicircle is
1/2*π*r^2=1/2*π*(10/2)^2=1/2*π*5^2
=1/2*π*25=(25/2)*π=12,5*π=12.5*3.14=39.25 approximately 39 square units
surface of the right triangle is
(6*8)/2=48/2=24 square units
so the surface of the shaded area is
surface of the semicircle minus the surface of the right triangle.
39-24=15 square units