89.4k views
1 vote
How to get the radius of a circle

2 Answers

2 votes

Answer:

simply get the diameter and divide it by 2 to get the half of the diameter which is the radius.

User Ivan Gerasimenko
by
8.2k points
2 votes

Radius of the circle can be obtained through different formulas. I will show you how to get it from Circumference and Area of the circle. We know that radius r equals to diameter divided by 2.

First we must be familiar with those two formulas.

We know that Area of circle is
A=\pi r^2 where r is our radius. We can solve the equation for r using operations on both sides of the equation hence,


A=\pi r^2\\A/\pi =(\pi r^2)/\pi \\r^2=A/\pi\\\boxed{r=√(A/\pi)}

We also know that Circumference C of circle is
C=2\pi r where again r is our radius. And again solve for r.


C=2\pi r\\C/2\pi = 2\pi r/2\pi\\\boxed{r=C/2\pi}\\

Hope this helps.

r3t40

User Shiju Samuel
by
8.4k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.