EM-1724

Tangent perpendicular to radius

E Math · Secondary 4 · Hard · Tangent perpendicular to radius

In a circle with centre

O

, the radius is 10 cm. Two tangents from an external point

P

touch the circle at

A

and

B

. Given that

\angle APB = \frac{\pi}{3}

, find the length of

PA

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