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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 & circumference of a circle given its radius or diameter.

There are two sets of area & circumference of circle worksheets

- Area & circumference of circles (inches, ft, yard)
- Area & circumference of circles (mm, cm)

**Find the circumference given the radius**

If you are given the radius of a circle, you can use the following formula to find the circumference of a circle:

C = 2πr

Where:

- C is the circumference of the circle.
- π (pi) is a mathematical constant approximately equal to 3.14159…
- r is the radius of the circle.

Example:

Find the circumference of a circle with a radius of 6 units. Use 3.14 for π.

C = 2πr = 2(3.14)(6) = 37.68 units

**Find the circumference given the diameter**

If you know the diameter (which is twice the radius), you can also use the formula:

C = πd

Where:

- C is the circumference of the circle.
- π (pi) is the mathematical constant approximately equal to 3.14159…
- d is the diameter of the circle.

Example:

Find the circumference of a circle with a diameter of 8 units. Use 3.14 for π.

C = πd = (3.14)(8) = 37.68 = 25.12 units.

**Find the area given the radius**

If you are given the radius of a circle, you can use the following formula to find the area of a circle:

A = πr^{2}

Where:

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

Example:

Find the area of a circle with a radius of 6 units. Use 3.14 for π.

A = πr^{2} = (3.14)(6)^{2} = 113.04 units^{2}

**Find the area given the diameter**

If you are given the diameter (which is twice the radius) then you would need to divide the diameter by 2 to get the radius and the use the formula A = πr^{2}

Example:

Find the area of a circle with a diameter of 8 units. Use 3.14 for π.

Divide the diameter by 2 to get the radius. Radius = 8 ÷ 2 = 4

A = πr^{2} = (3.14)(4)^{2} = 50.24 units^{2}

Have a look at this video if you need to review how to the area & circumference of a 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.)

Area & circumference of circle Worksheet #1 (inches, feet, yard)

Area & circumference 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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