Circumference 7th grade

Presentation

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Mathematics

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7th Grade

•

Practice Problem

•

Medium

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CCSS

7.G.B.4, HSG.C.A.2, HSG.GMD.A.1

Standards-aligned

Kathy Hobbs

Used 54+ times

FREE Resource

7 Slides • 15 Questions

Circumference -

7th grade

By Kathy Hobbs

Which is the diameter?

Which is the radius?

Which is the center?

Where is the circumference?

Discuss where they all are. Which one is the longest? The shortest?

Label the circle

Multiple Choice

What is the purple line in the picture called?

circumference

diameter

radius

center

Multiple Choice

What is the blue line in the picture called?

circumference

diameter

radius

center

Multiple Choice

What is the perimeter of a circle called?

circumference

diameter

radius

center

Diameter = 2 times radius

Radius = diameter divided by 2

Which is longer?

Radius and Diameter

Write down the three formulas to find circumference.

Pi is about 3.14... AND 22/7

Circumference

Multiple Choice

You can find the circumference by...

multiplying 3.14 times the diameter

the distance in the middle of the circle

half the diameter

twice the radius

Multiple Choice

The radius is

3.14... or 22/7

the distance in the middle of the circle

half the diameter

twice the radius

Multiple Choice

The diameter is

3.14... or 22/7

the distance in the middle of the circle

half the diameter

twice the radius

Multiple Choice

Pi is...

3.14... or 22/7

the distance in the middle of the circle

half the diameter

twice the radius

The diameter of a circle is 14 inches. What is the radius of the circle?

Example 1

Multiple Choice

The diameter of a circle is 20 cm. What's the radius?

40 cm

30 cm

20 cm

10 cm

Multiple Choice

The diameter of a circle is 7 ft. What's the radius?

5 ft

14 ft

3.5 ft

2.5 ft

Multiple Choice

The diameter of a circle is 60 ft. What's the radius?

20 ft

30 ft

3 ft

40 ft

The radius of a circle is 8 feet. What's the diameter?

Example 2

Multiple Choice

The radius of a circle is 9 ft. What is the diameter?

4.5 ft

18 ft

20 ft

16 ft

Multiple Choice

The radius of a circle is 19 ft. What is the diameter?

40 ft

36 ft

38 ft

9.5 ft

Use either 3.14 OR 22/7

If the radius is 21, what is the circumference?

Some text here about the topic of discussion.

Find Circumference

Multiple Choice

If the diameter is 10 ft, what is the circumference (about)?

(Remember C = pi times diameter)

22/7

3.14

0.314

31.4

Multiple Choice

If the radius is 5 ft, what is the circumference (about)?

(Remember C = pi times diameter)

22/7

3.14

0.314

31.4

Multiple Choice

Big Ben is a famous clock tower in London, England. The diameter of the clock face is 23 feet. Determine the circumference of the clock face. Round to the nearest tenth.

3.14(11.5) or

about 36.11 ft

3.14(23) or

about 72.2 ft

Circumference -

7th grade

By Kathy Hobbs

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