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More Math Worksheets

More Printable Math Worksheets
7th Grade Math

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 area from the circumference of a circle and how to find the circumference from the area of a circle.

There are two sets of area and circumference worksheets

- Area and circumference (inches, ft, yard)
- Area and circumference (mm, cm)

**Find the area given the circumference**

To find the area of a circle given its circumference, use the following steps:

- Use the formula for the circumference, C = 2πr

Find the radius (r):

r = C/(2π) - Once you have the radius, you can then find the area using the formula:

A = πr^{2}

Example:

Find the area of a circle with a circumference of 43.96 units. Use 3.14 for π.

r = 43.96/2π = 7 units

A = π(7)^{2} = 153.86 units^{2}

**Find the circumference given the area**

To find the circumference of a circle given its area, use the following steps:

- Use the formula for the area, A = πr
^{2}

Find the radius (r):

r = √(A/π) - Once you have the radius, you can then find the circumference using the formula:

C = 2πr

Example:

Find the circumference of a circle with an area of 113.04 units^{2}. Use 3.14 for π.

r = √(113.04/π) = 6 units

C = 2π(6) = 37.68 units

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

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

Click on the following worksheet to get a printable pdf document.

Scroll down the page for more **Area & Circumference 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

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