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A circle has an area of 81pi square units. What is the diameter of the circle A-18 B-9 C-162 D-none
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5 votes
A circle has an area of 81pi square units. What is the diameter of the circle

A-18
B-9
C-162
D-none

User Balthazar Rouberol
by
8.4k points

2 Answers

1 vote
Area of circle (Formula) = πr^2
81π = πr^2
r^2 = 81
radius = 9

Hope this helps!
User EEAH
by
7.3k points
2 votes
The diameter of the circle is 18 unit which is A. Hope it help!
User Ganapat
by
7.4k points
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