The tangents drawn at the end of a diameter of a circle are ______.

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KollegeApply · Accepted Answer

The tangents drawn at the end of a diameter of a circle are parallel. Explanation: Let O be the centre and A, B the endpoints of the diameter. OA and OB are collinear (one straight line). The tangent at a point is perpendicular to the radius at that point, so the tangent at A is perpendicular to OA and the tangent at B is perpendicular to OB; both tangents are therefore perpendicular to the same line, hence they are parallel.

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