Preview of Area of a Circle

Area of a Circle

Calculating the area of a circle

Multiple Choice

Quick check: The circumference describes the

• space inside the circle

• distance around the circle (perimeter)

The circumference is the DISTANCE AROUND THE CIRCLE (PERIMETER)

Now, let's talk about area!

The circumference is the DISTANCE AROUND THE CIRCLE (PERIMETER)

Now, let's talk about area!

Area of a circle is the amount of space inside the circle.

To calculate area of a circle we multiply 3.14 x radius²

That means we multiply the radius x itself first!

Multiple Choice

Remember that squaring a number (little 2) means multiplying it by itself. What is 3²

• 3

• 6

• 9

Multiple Choice

Remember that squaring a number (little 2) means multiplying it by itself. What is 5²

• 5

• 10

• 25

To calculate area of a circle, multiply the radius (short line) by itself. Then, multiply by 3.14

Multiple Choice

Let's try one! Find the area of this circle:

• 25

• 78.5

• 31.4

• First, square the radius 

• 5 x 5=25

• Then, multiply by 3.14

• 25 x 3.14=

• 78.5

Multiple Choice

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

Multiple Choice

Find the area of the circle

• 43.96

• 153.86

• 87.82

• 307.72