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What is the circumference (in inches) of a circle with a radius of 5 inches? Use 3.14 for π.

a) 10 inches
b) 15 inches
c) 31.4 inches
d) 78.5 inches

1 Answer

2 votes

Final answer:

The circumference of a circle with a radius of 5 inches is 31.4 inches, calculated using the formula C = 2πr, with π approximated as 3.14. Therefore, option (c) is correct.

Step-by-step explanation:

The question is asking for the circumference of a circle with a radius of 5 inches, using 3.14 for π (pi). The formula to calculate the circumference (C) of a circle is:

C = 2πr

Where 'r' represents the radius of the circle. To solve for 'C' using a radius (r) of 5 inches and π as 3.14, insert the values into the formula:

C = 2 × 3.14 × 5

Double the radius to get the diameter (5 inches × 2 = 10 inches), then multiply by pi:

C = 3.14 × 10

C = 31.4 inches

Therefore, the circumference of the circle is 31.4 inches, which corresponds to answer choice (c).

User Pramod Waghmare
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