How to Find Radius of Circle?
The radius of a circle can be found using the three basic radius formulas according to different conditions.
Let us use the following formulas to find the radius of a circle.
- If the Diameter is known, Radius = Diameter / 2
- If Circumference is known, Radius = Circumference / 2π
- If Area is known, Radius = √(Area of the circle/π)
For example:
- When the diameter is given as 28 cm, then the radius is R = 28/2 = 14 cm
- When the circumference of a circle is given as 66 cm, then the radius is R = 66/2π = 10.5 cm
- When the area of a circle is given as 154 cm2, then the radius is R = √(154/π) = 7 cm
Radius of Circle
Radius of Circle: The radius of a circle is the distance from the circle’s center to any point on its circumference. It is commonly represented by ‘R’ or ‘r’. The radius is crucial in nearly all circle-related formulas, as the area and circumference of a circle are also calculated using the radius.
In this article, we are going to learn about the Radius of the Circle in detail, including its Formula, Equation, and How to Find it with the help of Examples.
Table of Content
- What is the Radius of Circle?
- Radius of a Circle Definition
- Diameter of Circle
- Radius, Diameter and Chord
- Secant to Circle
- Tangent to Circle
- Non-Intersecting Lines
- Radius Formula
- How to Find Radius of Circle?
- Radius of Sphere
- Radius of Circle Equation
- Chord of Circle Theorems
- Radius of Circle Examples
- Practice Questions on Radius of Circle