13.47 x 3 = 4.47.
so, 4.47 is the unit price
D.
first of all we know if a half circle rotates 360°we will get a sphere, with a quarter circle, we will get a semi sphere. therefore we can eliminate choices A and B
with the diagram, the radius is 5, the diameter is 5*2=10 which means D is the correct answer
The first step is to "Measure the Segment"
So, option D is your answer.
Hope this helps!
