volume of a cylinder

Area of a Circle

• Radius

• Diameter

• Square

• Pi

Multiple Choice

What is the formula for area of a circle given the radius?

• A = πr

• A = 2πr

• A = πd

• A = πr²

Multiple Choice

What does

$$\pi$$  stand for?

• 18.14

• 14.12

• 3.14

• 0

Diameter

a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

RADIUS

a straight line from the center to the circumference of a circle or sphere.

Example 1

The Radius of this circle is 5 inches. What is the diameter?

Example 2

The DIameter of this circle is 22 centimeters. What is the radius?

Fill in the Blanks

Fill in the Blanks

Remember that when you square a whole number, we multiply that number by itself.

See the picture for examples.​

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Squaring Numbers

Multiple Choice

find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

Multiple Choice

A cruise ship has a large, circular window. It has a diameter of 8 meters.

What is the Radius?

• 8 m

• 16 m

• 64 m

• 4 m

Multiple Select

A cruise ship has a large, circular window. It has a diameter of 8 meters.

Set It Up:

• $$A=4^2\pi$$  

• $$A=4^2\times3.14$$  

• $$A=8\pi$$  

• $$A=64\times3.14$$  

• $$A=8\times8\times3.14$$  

Multiple Choice

A cruise ship has a large, circular window. It has a diameter of 8 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 50.27 m²

Volume of a Cylinder

Multiple Choice

What is the EXACT volume of the cylinder?

• $$60\pi\ cm^3$$

• $$120\pi\ cm^3$$

• $$300\pi\ cm^3$$

Multiple Choice

Which is the correct set up for the volume of the cylinder?

• $$V=\pi\times8\times15^2$$

• $$V=\pi\times8^2\times15$$

• $$V=\pi\times8\times15$$

Multiple Choice

What is the approximate area of the cylinder BASE?

• $$50.24cm^2$$

• $$16\pi cm^2$$

• $$36.78cm^2$$

• $$12.56cm^2$$