a bicycle is drawn on a grid such that the front tire is represented by the equation (x-16)^2+y^2=9 what is the tire's diameter? A. 6 B. 3 C. 9 D. 4

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The equation of a circle is equal to: (x – h)^2 + (y – k)^2 = r^2 where r is the radius (x-16)^2 + y^2 = 3^2 So the radius is equal to 3. We are asked to give the diameter. Multiply the radius by 2. Then the diameter is 3*2 = 6 The correct answer is letter A. 6

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