1.

from an external point p two tangents PQ and PR are drawn to a circle of radius 4cm with centre O. If QPR = 90`, then length of PQ is

Answer»

gth of PQ is 4 cm .TANGENT of a circle make 90 degree with respect to center . Let center of the circle be O .  Join PQORP to form a QUADRILATERAL .Three angles of the quadrilateral are  90 degree then the fourth angle at center will be of 90 also .Two adjacent SIDE that is QO and RO are equal . THUS the quadrilateral is a square .The length of PQ will be 4 cm .



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