SOLUTION: If the diameter of a circle is 27 meters, what is the area? Round to the nearest tenth

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Question 530880: If the diameter of a circle is 27 meters, what is the area? Round to the nearest tenth
Found 2 solutions by jim_thompson5910, oberobic:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
If the diameter of a circle is 27 meters, then the radius is 27/2 = 13.5 meters


So r = 13.5


A=pi%2Ar%5E2 Start with the area of a circle formula.


A=pi%2A%2813.5%29%5E2 Plug in r=13.5.


A=%283.14159265%29%2A%2813.5%29%5E2 Replace pi with 3.14159265 (note: Use more digits of pi to get better accuracy).


A=%283.14159265%29%2A%28182.25%29 Square 13.5 to get 182.25.


A=572.5552604625 Multiply 3.14159265 and 182.25 to get 572.5552604625 (this figure is approximate).


A=572.6 Round to the nearest tenth.


So the area is roughly 572.6 square meters.


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Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
d = diameter
d = 27 m
r = radius
r = 1/2 d
r = 13.5 m
Area = pi*r^2
A = pi * 13.5^2
A = 572.555261 m^2
.
We are told to round to the nearest 10th.
.
Answer: Area is 572.6 m^2.
.
Done.