Question 273256: If measures 135, what is the length of the radius of this circle? Round your answer to two decimal places.
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! if you are talking about the circumference of the circle, then the equation is:
c = 2*pi*r
When c = 135, this formula becomes:
135 = 2*pi*r
divide both sides of this equation by 2*pi to get:
r = 135/(2*pi) which makes r = 21.48591732
rounded to the nearest 2 decimal places, that becomes 21.49.
If you are talking about the area of the circle, then the equation for that is:
a = pi*r^2
When a = 135, this formula becomes:
135 = pi*r^2
divide both sides of this equation by pi to get:
42.97183463 = r^2
take square root of both sides of this equation to get:
r = sqrt(42.97183463) = 6.555290584
rounded to the nearest 2 decimal places, that becomes r = 6.56,
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