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The area of a circle is 16pi ft^2. What is the 원둘레, in inches? Express your answer in terms of pipi.Find the 지름 of a circle with an area of 415.48 square inchesThe product of two consecutive numbers is 72. Use a quadratic equation to find the two sets of numbers.An item is regularly priced at 20 dollars . It is on sale for 70% off the regular price. What is the sale price?What was the original price of a football 30% 104