If the angle between two radii of a circle is 100 degree, the angle between the tangents at the ends of those radii is

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80 degree...

the tangents n the radii form a quadrilateral..

two angles of the quadrilateral will be 90 degrees each, since tangents are perpendicular to the radius... the third angle is 100 as in question... so fourth angle, i.e., one between the tangents = 360 - 90 - 90 - 100 = 80

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