1.

Ab and cd are common tangent to circle of unequal radus .prove that ab =cd

Answer»

Here AB and CD are extended then they are intersecting at P.

Length of two TANGENTS drawn from external point to a CIRCLE are equal.

AP = CP ----------(1)
BP = DP ----------(2)

Substracting (2) from (1) we get

AP - BP = CP - DP

∴ AB = CD


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