Question

In the diagram below, CD is a tangent to the circle centre O. If ABC = 54°, calculate the size of C₁.

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Answer 1

the size of C1=54°[converse of a tan chord theorem]

Explanation:

since the tan chord theorem state that the angle between a tangent and a chord is equal to the angle sub tended by that chord and in this situation your given the sub tend angle we intend to say is a converse of the tan chord