Set 8: Linear Equations

Explanation

Answer: A

Solve for $r$ : $C = 2\pi r$

r = C / (2\pi)

✓ Correct

r = 2\pi C

r = 2\pi / C

r = C - 2\pi

Detailed Explanation

Choice A is correct. Choice Ahoice C is the correct answer. 1. Start: $C = 2\pi r$ 2. Divide by $2\pi$ : $r = \frac{C}{2\pi}$ Choice Ahoice D is incorrect because multiplied instead of divided. Choice Ahoice D is incorrect because subtracted instead of divided. Choice Ahoice C is incorrect because inverted.

Key Steps:

•

The correct answer is r = C / (2\pi)

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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