In Fig. 9.1, the pair of Tangents $AP$ and $AQ$ drawn from an external point $A$ to a circle with centre $O$ are perpendicular to each other and length of each tangent is $5cm$. Then the radius of the circle is
A. $10cm$
B. $7.5cm$
C. $5cm$
D. $2.5cm$
Answer:C
In Fig. 9.1, the pair of Tangents $AP$ and $AQ$ drawn from an external point $A$ to a circle with centre $O$ are perpendicular to each other and length of each tangent is $5cm$. Then the radius of the circle is
A. $10cm$ B. $7.5cm$ C. $5cm$ D. $2.5cm$