The Area Of A Circle Is How Find The Radius Of The Cirle?


3 Answers

Oddman Profile
Oddman answered
The area of a circle is given by the formula
a = Pi*r2 (where "a" is the area, and "r" is the radius of the circle. Pi is an irrational number approximated by 3.1416.)

We can solve for r:
a/Pi = r2 (divide both sides by Pi)
√[a/Pi] = r (take the square root of both sides)

√[460/3.1416] = r (plug in the numbers)
√146.42 = r (evaluate)
12.1 = r

Pi*r2 = 460
3.1416*(12.1)2 = 460
3.1416*146.41 = 460 (we note that 146.41 here is not the same as 146.42 above)
459.962 = 460 (We recognize that there is some error. This amount appears to be acceptable and unavoidable, given the precision of the math.)

amber Jhon Profile
amber Jhon answered
The formula to calculate the radius from the area of the circle is as follows:

A = pi * r2


A = area

pi = 3.14

r = radius

By putting the value of area in the equation you will get,

A = pi * r2

460 = 3.14 * r2

460/3.14 = r2

146.5 = r2

Taking square root on both sides, which will give,

r = 12.1

thanked the writer.
Oddman commented
Pie is a sweet dessert, not the name of a Greek letter.
amber Jhon
amber Jhon commented
Well I just know it's symbol and could not find it on my keyboard :)
Anonymous Profile
Anonymous answered
To find the radius of a circle you must times that number by 2.

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