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Mathematics > Standard Multiple Choice

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In the figure above, the circle with center A and the circle with center C are tangent at point D. If the circles each have radius 10, and if line l is tangent to the circle with center A at point B, what is the value of x?

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The measure of angle A B C is 90 degrees because a line tangent to a circle is perpendicular to the radius of the circle that contains the point of tangency. This means that triangle A B C is a right triangle.

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