# How to Find the Area and Circumference of Circles? (+FREE Worksheet!)

Learn how how to find the Area and Circumference of Circles when you have the radius or the diameter of the circle.

## Related Topics

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## A step-by-step guide to solving Circles

• In a circle, variable $$r$$ is usually used for the radius and $$d$$ for the diameter, and $$π$$ is about $$3.14$$.
• Area of a circle $$\color{blue}{=πr^2}$$
• Circumference of a circle $$\color{blue}{=2πr}$$

### Circles – Example 1:

Find the area of the circle.

Solution:

Use area formula: Area $$=πr^2$$,
$$r=6$$ $$in$$, then: Area $$=π(6)^2=36π$$

$$π=3.14$$, then: Area $$=36×3.14=113.04$$ $$in^2$$

### Circles – Example 2:

Find the Circumference of the circle.

Solution:

Use Circumference formula: Circumference $$=2πr$$
$$r=9$$ $$cm$$ , then: Circumference $$=2π(9)=18π$$
$$π=3.14$$, then: Circumference $$=18×3.14=56.52$$ $$cm$$

### Circles – Example 3:

Find the area of the circle.

Solution:

Use area formula: Area $$=πr^2$$,
$$r=4$$ $$in$$, then: Area $$=π(4)^2=16π$$

$$π=3.14$$, then: Area $$=16×3.14=50.24$$ $$in^2$$

### Circles – Example 4:

Find the Circumference of the circle.

Solution:

Use Circumference formula: Circumference $$=2πr$$
$$r=6$$ $$cm$$ , then: Circumference $$=2π(6)=12π$$
$$π=3.14$$, then: Circumference $$=12×3.14=37.68$$ $$cm$$

$14.99 Satisfied 92 Students ## Exercises for Solving Circles ### Find the area and circumference of each circle. $$(\pi=3.14)$$ ### Download Circles Worksheet 1. $$\color{blue}{Area: \ 50.24 \ in^2 , \ Circumference: \ 25.12 \ in}$$ 2. $$\color{blue}{Area: \ 1,017.36 \ cm^2, \ Circumference: \ 113.04 \ cm}$$ 3. $$\color{blue}{Area: \ 78.5 \ m^2, \ Circumference: \ 31.4 \ m}$$ 4. $$\color{blue}{Area: \ 379.94 \ cm^2 , \ Circumference: \ 69.08 \ cm}$$ The Greatest Books for Students to Ace the Algebra ## Related to This Article ### More math articles ### What people say about "How to Find the Area and Circumference of Circles? (+FREE Worksheet!) - Effortless Math: We Help Students Learn to LOVE Mathematics"? No one replied yet. X 45% OFF Limited time only! Save Over 45% SAVE$40
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