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해법
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circle has a 원둘레 of 31pi centimeters. What is the diameter, in centimeters, of the circle?The radius of a 원형 is 5 cm. Find its area in terms of pipi.four more than a number is at least 11112% of what number is 33If 30,000 is invested at 5% annual interest compounded monthly, how long would it take for the account balance to reach 90,000? Round your answer to the nearest tenth.