In the given figure, PQRS is a square inscribed in a circle of radius 4 cm. PQ is produced till point Y. From Y, a tangent is drawn to the circle at point R. What is the length (in cm) of SY?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 4√10.
PQ = QR = RS = SP = 
Let QY = x
RY2 = YQ × YP
