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주어진 원 둘레
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The radius of a 원형 is 9 cm. Find its area in terms ofThe radius of a 원형 is 3 inches. What is the 원형's area?Prove algebraically that the 차이 between the squares of any two consecutive integers is equal to the sum of these two integers.The 원둘레 of a circle is 18pi cm. What is the area, in square centimeters? Express your answer in terms of pipi.The sum of two numbers is 48. The smaller number is 8 less than the larger number. What are the numbers?