From an external point P, tangents PA are drawn to a circle with centre O. If CD is the tangent to the circle at a point E and PA = 14 cm, find the perimeter of 
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Given: PA and PB are tangent to the circle with centre O
CD is tangent to the circle at E which intersect PA and PB in C and D
To find : Perimeter of triangle PCD
Proof:
10