Find Radius from Area Worksheets

There are six sets of circle worksheets:

• Circumference Worksheets
  
• Area of Circle Worksheets
  
• Area & Circumference Worksheets
  
• Find Radius from Circumference
  
• Find Radius from Area
  
• Find Area from Circumference or vice versa
  

Examples, solutions, videos, and worksheets to help grade 7 and grade 8 students learn how to find the radius from the area of a circle.

How to find the radius from area of a circle?

There are two sets of radius from area of circle worksheets

• Radius from area of circles (inches, ft, yard)
• Radius from area of circles (mm, cm)

To find the radius of a circle given its area, you can rearrange the formula for the area:

A = πr²

Solve for the radius (r):

r = √(A/π)

Where:

r is the radius of the circle.
A is the area of the circle.
π (pi) is a mathematical constant approximately equal to 3.14159…

Example:
Find the radius of a circle with a area of 113.04 units². Use 3.14 for π.
r = √(113.04/π) = 6 units

Have a look at this video if you need to review how to find the radius from area of a circle.

• Find the Radius of a Circle Given the Area

Click on the following worksheet to get a printable pdf document.
Scroll down the page for more Radius from area of circle Worksheets.

 

More Radius from area of circle Worksheets

Printable
(Answers on the second page.)
Radius from area of circle Worksheet #1 (inches, feet, yard)
Radius from area of circle Worksheet #2 (mm, cm)

Online
Circumference of Circle
Area of Circle
Area & Circumference of Circle

Circle Problems: Circumference, Area
Circle Word Problems 1
Circle Word Problems 2

Area of shaded regions that include circles
Area of figures that include circles
Area of figures that include circles

Arc Length & Area of Sector (Degrees)
Arc Length & Area of Sector (Radians)
Convert between Radians and Degrees

Related Lessons & Worksheets

Circumference of a Circle

More Printable Worksheets

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