61. 
PA and PB are tangents to the circle and O is the centre of the circle. The radius is 5 cm and PO is 13 cm. If the area of the triangle PAB is M, value of $$\sqrt {\frac{{\text{M}}}{{15}}} $$ is :
PA and PB are tangents to the circle and O is the centre of the circle. The radius is 5 cm and PO is 13 cm. If the area of the triangle PAB is M, value of $$\sqrt {\frac{{\text{M}}}{{15}}} $$ is :
62. ln ΔABC, BD ⊥ AC at D. $$x$$ is a point on BC such that ∠BEA = $$x$$°. If ΔEAC = 62° and ΔEBD = 60°, then the value of $$x$$ is:
63. O is a point in the interior of ΔABC such that OA = 12 cm, OC = 9 cm, ∠AOB = ∠BOC = ∠COA and ∠ABC = 60°. What is the length (in cm) of OB?
64. In ΔABC, D is the median from A to BC. AB = 6 cm, AC = 8 cm, and BC = 10 cm. The length of median AD (in cm) is:
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