Explanation Given: The given circle’s radius is 4 kilometers. r = 4 km Formula used: The formula that is used to calculate circumference of a circle C = 2 π r The formula that is used to calculate area of a circle A = π r 2 Where, C is the circumference of the circle. A is the area of the circle. r is the radius of the circle. π is constant with the value of ≃ 3.14 Calculation: To find the circumference, we substitute the values of r = 4 km and π =3 .14 into the formula C = 2 π r It is necessary to use the unit of the radius. Then we get the value of circumference in the same unit. C = 2 π r C = 2 ⋅ 3.14 ⋅ 4 km ( upon substituting data ) C = 25.12 km ( simplifying the multiplication ) Thus, the circumference of the given circle is 25

Using & Understanding Mathematics: A Quantitative Reasoning Approach (7th Edition)

7th Edition

ISBN: 9780134705187

Author: Jeffrey O. Bennett, William L. Briggs

Publisher: PEARSON

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Chapter 10.A, Problem 32E

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The circumference and the area of the circle.

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Chapter 10.A, Problem 31E

Chapter 10.A, Problem 33E

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Chapter 10 Solutions

Using & Understanding Mathematics: A Quantitative Reasoning Approach (7th Edition)

Ch. 10.A - Prob. 1QQ Ch. 10.A - Prob. 2QQ Ch. 10.A - An acute angle is a. less than 90°. b. exactly...Ch. 10.A - 4. A regular polygon always has a. four sides. b....Ch. 10.A - 5. A right triangle always has three equal-length...Ch. 10.A - 6. The circumference of a circle of radius r...Ch. 10.A - The volume of a sphere of radius r is a. \[\pi...Ch. 10.A - Prob. 8QQ Ch. 10.A - If you triple the radius of a sphere, the volume...Ch. 10.A - Suppose you cut a large stone block into four...

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