- Why is it that in finding the area of a circle you use radius not the diameter?

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What is the nth term of the arithmetic sequence 7 5 3 1? What is the square footage of a 100 yards by 50 yards? What is the sum of the first five hundred even numbers not counting zero? To get three image of an object one should have to place two plane mirror at an angle of? What is the radius of a circle of perimeter 40 cm?