Circle Calculator
A circle is formed by the set of points that are at a constant or at a fixed distance (radius) from a fixed point (center) in the plane. The fixed point is called the origin or center of the circle.
What is Circle Calculator?
'Cuemath's Circle Calculator' is an online tool that helps to calculate the area and perimeter for a given radius. Cuemath's online Circle Calculator helps you to calculate the area and perimeter in a few seconds.
How to Use the Circle Calculator?
Please follow the below steps to find the area and perimeter:
- Step 1: Enter the radius of the circle in the given input box.
- Step 2: Click on the "Calculate" button to find the area and perimeter
- Step 3: Click on the "Reset" button to find the area and perimeter with a different radius.
How to find the Circle Calculator?
Area of Circle is defined as the amount of space enclosed within the boundary of a circle. It is measured in square units. The formula to calculate the area of a circle is:
Area of a circle = πr2 square units
Where,'r' is the radius of the circle and π(Pi) is the mathematical constant with an approximate value of 3.14.
The perimeter of a circle is defined as its boundary or the complete arc length of the periphery of a circle. It is also known as the circumference of a circle. The formula to calculate the perimeter of a circle is:
Perimeter of a circle = 2πr units
Where,'r' is the radius of the circle and π(Pi) is the mathematical constant with an approximate value of 3.14.
Solved Example:
Find the area and perimeter of a circle, if the radius is 5 units.
Solution:
Given: Radius (r) = 5 units
Area of a circle = πr2
= 3.14 × 52
= 3.14 × 25
= 78.5 square units
Perimeter of circle = 2πr
= 2 × 3.14 × 5
= 31.4 units
Similarly, you can try the calculator and find the area and perimeter of a circle for the following:
- Radius = 7 units
- Radius = 11 units
- Radius = 8 units