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O is the center of the circle.Assume that lines that appear to be tangent. What is the value of x?

O is the center of the circle.Assume that lines that appear to be tangent. What is-example-1

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So line QP is the tangent which means angle Q is 90 degrees. All three angles of a triangle added together is 180 degrees so:
x = 180 - 90 - 12
x = 78
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