Finding the Area of a Circle

You can determine the radius of a circle by

• multiplying $\pi$ by the diameter.

• dividing the diameter by 2.

• multiplying the radius by 2.

You can find the diameter of a circle by

• multiplying the radius by  $\pi$  .

• dividing the diameter by 2.

• multiplying the radius by 2.

The formula for finding the area of a circle is

• $A\ =\ \pi r^2$

• $A\ =\ \pi d$

• $C\ =\ 2\pi$

The area of a circle with the radius of 4 in. is

•  $12.56\ in$  

•  $25.12\ in$  

•  $50.24\ in$  

Find the area of a circle with diameter of 12 ft.

• $113.04\ ft^2$

• $124\ ft^2$

• $156\ ft^2$

Find the area of a round room with a diameter of 16 m.

• $200.96\ m^2$

• $100.48\ m^2$

• $150\ m^2$

What is the area of wheel with a radius of 18 in.?

• $254.34\ in^2$

• $113.04\ in^2$

• $56.52\ in^2$

A basketball has a radius of 15 cm, what is the area?

• $986.5\ cm^2$

• $706.5\ cm^2$

• $314\ cm^2$

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