Area of Circles

Area of Circles

Multiple Choice

Which expression shows the area of the circle with a radius of 6 feet. Use 3.14 for $$\pi$$ .

• $$\pi\cdot3^2$$

• $$\pi\cdot6^2$$

• $$12\pi$$

Fill in the Blank

Find the area. Use 3.14 for $$\pi$$ .

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Find the area. Use 3.14 for $$\pi$$ .

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The radius of a circle is 8 centimeters. What is the circle's area?

Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

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Multiple Choice

Which expression can be used to find area of the circle with a diameter of 28 meters. Use 3.14 for $$\pi$$ .

• $$\pi\cdot28^2$$

• $$\pi\cdot14^2$$

Fill in the Blank

Find the area. Use 3.14 for $$\pi$$ . Round your answer to the nearest tenths.

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Multiple Choice

Which expression can be used to calculate the area of the semi-circle?

• $$\frac{\pi\cdot11^2}{2}$$

• $$\pi\cdot11^2$$

• $$22\pi$$

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What is the value of $$\frac{\pi\cdot11^2}{2}$$

Round your answer to the nearest whole number.

Multiple Choice

Which expression can be used to calculate the area of the semi-circle?

• $$\frac{\pi\cdot8^2}{2}$$

• $$\frac{\pi\cdot4^2}{2}$$

• $$\frac{\pi\cdot16^2}{2}$$

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What is the area of this semicircle?

Round your answer to the nearest tenth?

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Multiple Choice

A tsunami warning signal can be heard 2.5 miles away in all directions. For how many square miles can the siren be heard?

Which description explains how to answer this question.

• Find the area of a circle with a radius of 2.5 miles.

• Find the area of a circle with a radius of 5 miles.

• Find the area of the circle with a radius of 1.25 miles.

Multiple Choice

A tsunami warning signal can be heard 2.5 miles away in all directions. For how many square miles can the siren be heard?

Which expression represents the solution to this problem.

• $$\pi\cdot5^2$$

• $$\pi\left(1.25\right)^2$$

• $$\pi\cdot2.5^2$$

Fill in the Blank

A tsunami warning signal can be heard 2.5 miles away in all directions. For how many square miles can the siren be heard?

Round your answer to the nearest tenth.

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Multiple Choice

What is the area?

• 56.52

• 28.26

• 254.34

Fill in the Blank

What is the area?

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Multiple Choice

Which expression matches the area of the tree stump?

• $$100\pi$$

• $$10\pi$$

• $$5\pi$$

• $$50\pi$$

Multiple Choice

How can you find the area of a semi-circle?

• Find the area of a circle and then divide it by 2

• Find the area of a circle and multiply by 2

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What is the area of the semi-circle? Remember it is half the area of the circle.

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What is the area of the semi-circle? Remember it is half the area of the circle.

Round your answer to the nearest whole number.

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What is the area of the semi-circle? Remember it is half the area of the circle.

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Multiple Choice

If you know the circumference of a circle, how do you find the radius?

• Divide by Pi to get the diameter and then divide the diameter by two to get the radius.

• Multiply by Pi to get the diameter and then multiply the diameter by 2 to get the

Multiple Choice

The plate for a microscope has a circumference of $$100\pi$$ millimeters. What is the area of the plate.

• 314

• 3140

• 31400

• 100

Multiple Choice

A dog is leashed to a corner of a house. How much running area does the dog have? Which expression would give the correct answer.

• $$\left(\frac{3}{4}\right)\pi\cdot20^2$$

• $$\left(\frac{1}{2}\right)\pi\cdot20^2$$

• $$\left(\frac{3}{4}\right)\cdot20\pi$$

• $$\left(\frac{1}{2}\right)\cdot20\pi$$