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22 π in
📐The area of a circle is given by the formula A = πr², so we start by setting πr² = 121π.
🧮Dividing both sides by π gives r² = 121, and then taking the square root of both sides gives r = 11.
📏The circumference of a circle is calculated using C = 2πr, so plugging in r = 11 results in C = 2π × 11 = 22π.
🔍This confirms that the correct circumference in terms of π is 22 π in, based on the relationship between radius and area.
📌Core Message
Use area to find radius, then apply the circumference formula 2πr to get the correct answer.
This question is from MATH 2023 Exam-1 which contains 38 questions.
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