Height of the balloon, OB = h Tangents are equally inclined to the line joining the centre of the circle and the external point from where the tangents are drawn.
∴∠OAP=∠OAQ=
60∘
2
=30∘ Also ∠OPA=90° Remember: Radius is perpendicular to the tangent at the point of contact In ΔOAp sin30°=