Question

The angle formed by a tangent and a radius is​

Answer 1

Answer:

We use facts about related angles. A tangent makes an angle of 90 degrees with the radius of a circle, so we know that ∠OAC + x = 90. The angle in a semi-circle is 90, so ∠BCA = 90.

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Answer 2

Answer:

90 degree

Step-by-step explanation:

The angle formed by a tangent and a radius is 90 degree. Because the tangent line of a circle is always at right angles to the radius at the point of contact. and also the angle formed in a semi-circle is 90 degree.