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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

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The circle shown above has center O and a radius of length 5. If the area of the shaded region is 20 times pi, what is the value of x?

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You can figure out the area of the whole circle, since you know that the radius is five. From the area of the whole circle and the area of the shaded part, it is possible to find the measure of the angle that has its vertex at point O and is in the right triangle. Once you find that angle measure, you can find the value of  x.

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