A.
80t3
Step-by-step explanation:
80t^3
Simplify the radical by breaking the radicand up into a product of known factors, assuming positive real numbers.
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: