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As the tangent is always perpendicular to the radius the distance between the tangent will be equal to the diameter of the circle => distance between the tangents = 2r = 2*10 = 20 cm
When the tangent is drawn to circle the Diameter is perpendicular to Tangent.
The dia of circle is 2*10= 20 cm.
When two tangents are parallel then they are separated by dia.
Hence the distance is 20cm.