In the diagram below ab and bc are tangent to o. which equation could be solved to find x, the measure of ac?

A) 1/2(238-x) = 58

Step-by-step explanation:

When an angle is formed by two secants, a tangent and a secant, or two tangents of a circle, the measure of this angle is one-half of the difference between the intercepted arcs.

In this circle, the intercepted arc measures are 238° and x°.  Their difference would be (238-x).  One-half of this would be 1/2(238-x).  This is equal to the angle measure, which is 58°.  This gives us the equation

1/2(238-x) = 58

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step-by-step explanation: