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.

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

Related Topics

The Absolute Best Books to Ace Pre-Algebra to Algebra II

Original price was: $89.99.Current price is: $49.99.

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 \(=12×3.14=37.68\) \(cm\)

The Best Book to Help You Ace Pre-Algebra

Original price was: $24.99.Current price is: $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

Original price was: $29.99.Current price is: $19.99.
Original price was: $29.99.Current price is: $19.99.
Original price was: $29.99.Current price is: $19.99.
Original price was: $29.99.Current price is: $19.99.

Related to This Article

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.

Leave a Reply

X
45% OFF

Limited time only!

Save Over 45%

Take It Now!

SAVE $40

It was $89.99 now it is $49.99

The Ultimate Algebra Bundle: From Pre-Algebra to Algebra II