This is how you do it. Set two equations equal to each other then solve. Plug in x for each equation, find the answers. AC is the base because it is not congruent to any other side.
I believe its A, since the absolute value brackets are used to show how far away a number is from 0. All of the other answers are correct, but A makes the most sense here.
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calculator soup will help you with this one
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The formula to determine the circumference is: 2 x 3.14 x radius. All you need to do is plug in the value of the radius, 56, and multiply it by 2 and 3.14.
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