Question

Find the diameter of a circle with an area of 804.2 square centimeters. (Use 3.14 for )
Select one:
a. 32 cm
b. 8 cm
c. 48 cm
d. 64 cm

Answer 1

A=pir^2
pi=3.14
2r=d
804.2=pir^2
804.2=3.14r^2
divide by 3.14
256.1146...=r^2
sqrt both sides
16=r
2r=d
2*16=d=32

answer is A