The area of a rectangle is modeled by the graph where y is the area.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

step-by-step explanation:

what i would say the best answer is a. 40.5

the correct answers i think are b. and d.

give me brainliest if it is correct!