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
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The length 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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