Calculators, Formulas and Work with Steps -
Calculate :

Radius :

Area :

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Find Area, Circumference or Radius - Circle Calculator's Circle Calculator is an online basic geometry tool to calculate area, circumference, diameter or radius of a circle shape, in both US customary & metric (SI) units.

Steps to Find Area of a Circle

The step by step workout for how to find what is the area of a circle. Students may use this circle calculator to generate work with steps for any other similar input values.Workout :
step1 Address the formula, input parameters and values
Radius = 5 in

step 2 Find area of circle using radius values
Area = πr²
= π x (5)² in²
= 22/7 x 25 in²
Area = 78.5714 in²

Circle & Formulas

Circle is a round plane with every point on its boundary consists of equal length from the center point. Any distance between any point on the boundary and the center is called the radius. The straight from any point to another through the the center point is called the diameter. K-12 students may refer the below formulas of circle to know what are all the input parameters are being used to find the area, perimeter or radius of a circle.

circle formulas to calculate area, circumference, diameter & radius
Formula to calculate area, circumference, diameter & radius of a circle

Problems on Area, Circumference or Radius of a Circle

Below are the practice problems for grade school students, on finding what is the area, perimeter or circumference of a circle. By click on the corresponding problem shows the step-by-step calculation or work with steps for how to find the area, circumference or radius of a circle. For any other similar values, use this circle calculator to verify the results.
Calculators and Calculations