O is the centre of a circle with radius 12 cm., T is the point on the circle. AT is a tangent to the circle AOT = 60°. What is the length of AO ?
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Answer:
In ∆PBT, PT=6 cmNow, cos(∠P)=
PT
PB
⇒cos60°=
PT
PB
⇒
1
2
=
6
PB
∴PB=12 cm
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