Homework Explained - Math Practice 101

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Chapter 8: Measure Figures; Lesson 1: Circumference

Find the radius or diameter of each circle with the given dimensions.

• Question 1

d = 5 mm

•  $$r=$$ $$\text{mm}$$
• Question 2

d = 24 ft

•  $$r=$$ $$\text{ft}$$
• Question 3

r = 17 cm

•  $$d=$$ $$\text{cm}$$

Find the circumference of each circle. Use 3.14 or $$\frac{22}{7}$$ for $$\pi$$. Round to the nearest tenth if necessary.

• Question 4

•  $$C\approx$$ $$\text{ft}$$
• Question 5

•  $$C\approx$$ $$\text{cm}$$
• Question 6

•  $$C\approx$$ $$\text{mi}$$
• Question 7

The largest tree in the world by volume is  in Sequoia National Park. The diameter at the base is 36 feet. If a person with outstretched arms can reach 6 feet, how many people would it take to reach around the base of the tree?

•  people
• Question 8

The Belknap shield volcano is located in the Cascade Range in Oregon. The volcano is circular and has a diameter of 5 miles. What is the circumference of this volcano. Round your answer to the nearest tenth?

•  $$C\approx$$ $$\text{miles}$$
• Question 9

Be Precise Refer to the circle at the right.

a. Find the circumference of the circle. Use 3 as the estimate of $$\pi$$.

•  $$C\approx$$ $$\text{mm}$$
• Question 9

b. Find the circumference of the circle using 3.14 for $$\pi$$.

•  $$C\approx$$ $$\text{mm}$$
• Question 9

c. Another estimate of $$\pi$$ is 3.14159. Find the circumference using this estimate.

•  $$C\approx$$ $$\text{mm}$$
• Question 9

d. What do you notice about the estimate used for $$\pi$$ and the circumference of the circle?

• Type below:

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