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29-04-2016
Mathematics

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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

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apologiabiology apologiabiology

29-04-2016

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

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