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Area and Circumference of a Circle

Area and Circumference of a Circle

Assessment

Presentation

Mathematics

7th Grade

Practice Problem

Medium

CCSS
7.G.B.4, HSG.GMD.A.1

Standards-aligned

Created by

Lance Knudson

Used 108+ times

FREE Resource

8 Slides • 11 Questions

1

Area and Circumference of a Circle

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Terms, Values, and Formulas to Remember

  • Radius - a straight line from the center to the circumference of a circle

  • Diameter - a straight line passing from side to side through the center of a circle

  • Diameter is twice the radius, i.e.,  d=2rd=2\cdot r  

  •  \pi=3.14  

  • Area of a Circle: \pi\cdot r^2  

  • Circumference of a Circle:  2\pi r  or  \pi\cdot d  

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Fill in the Blank

 π=\pi=  

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Multiple Choice

What formula can be used to find the circumference of a circle?

1

A=bhA=b\cdot h

2

A=πr2A=\pi\cdot r^2

3

C=πdC=\pi\cdot d

8

Multiple Choice

What formula can be used to find the circumference of a circle?

1

A=\pi\cdot r^2

2

 C=2\pi\cdot r 

3

 A=bhA=b\cdot h  

9

Fill in the Blank

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What is the circumference of the circle shown? Round your answer to the nearest tenths place.

10

Fill in the Blank

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What is the circumference of the circle shown? Round your answer to the nearest tenths place.

11

Fill in the Blank

The circumference of a circle is 37.68 feet. What is the radius of the circle?

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13

Multiple Choice

What formula can be used to find the area of a circle?

1

A=bhA=b\cdot h

2

A=πr2A=\pi\cdot r^2

3

A=12bhA=\frac{1}{2}b\cdot h

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15

Fill in the Blank

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What is the area of the circle shown? Round your answer to the nearest tenths place.

16

Fill in the Blank

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What is the area of the circle shown? Round your answer to the nearest tenths place.

17

Fill in the Blank

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CHALLENGE PROBLEM! A pulley has many uses in mechanics and is measured by its diameter. If a 10 inch pulley spins a belt that is 84 inches long. How many rotations of the pulley does it take to turn the belt over once? Round your answer to the nearest tenth of a rotation.

18

Multiple Choice

CHALLENGE PROBLEM! Two pizza chains claim they are the cheesiest. 

Hugo's uses 6 ounces of cheese on their personal sized pizzas with an area of 201 square inches. 

DeLorenzo's also uses 6 ounces of cheese on their personal sized pizzas and they have a circumference of 47.1 inches.

Which pizza chain has the most cheese given its area?

1

Hugo's

2

DeLorenzo's

19

Area and Circumference of a Circle

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