Area of a Circle

Area of a Circle

Area is the space inside of the circle.

Formula for Area of a Circle:  $A=\pi\cdot r^2$  

 $3.14\left(radius\right)^2$  

Multiple Choice

Which of these do I need to find the area of a circle?

• Diameter

• Radius

• Circumference

Multiple Choice

Which of these is the correct formula for the AREA of a circle?

•  $C=\pi d$  

•  $A=\pi\cdot r^2$  

•  $C=2\cdot\pi\cdot r$  

Multiple Choice

What is the area of a circle with a radius of 8cm?

 $A=\pi\cdot r^2$  

• 200.96

• 25.12

• 50.24

Multiple Choice

What is the area of a circle with a radius of 6cm?

 $A=\pi\cdot r^2$  

• 18.84

• 113.04

• 50.24

Multiple Choice

What is the area of a circle with a diameter of 8 in? (Remember that you need the radius...not diameter)

 $A=\pi\cdot r^2$  

• 200.96

• 113.04

• 50.24

Multiple Choice

What is the area of a circle with a diameter of 18 in? (Remember that you need the radius...not diameter)

 $A=\pi\cdot r^2$  

• 1017.36

• 254.34

• 56.52

Real Life Example:

How could area help me in this yard picture?