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:
so then what are you asking?
i believe the answer is 323 ft
180-142=38 for the acute angle next to the entry
90+38=128
180-128=52
a=52