MATHEMA
Prove that the tangents drawn at the ends of a diameter of a circle are parallel.
Prove that the perpendicular at the point of
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Let AB be a diameter of the circle.
Two tangents CD and EF are drawn at points A and B respectively.
Radius drawn to these tangents will be perpendicular to the tangents.
Since alternate interior angles are equal, lines CD and EF will be parallel.
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