# Perpendiculars are drawn from angles A, B, C of an acute angled triangle...

#### cooldudeachyut

Question : Perpendiculars are drawn from vertices A, B, C of an acute angled triangle on the opposite sides and produced to meet the circumscribing circles. If these produced parts be p, q, r. Then show that
(a/p) + (b/q) + (c/r) = 2(tanA + tanB + tanC).
where a, b, c are the sides opposite to vertices A, B, C respectively. A, B, C are also the angles made at the respective vertices.

My attempt: I don't know how to calculate and represent p, q, r in the terms of a, b, c and A, B, C to proceed in this question. Please help.

#### Idea

Label the points: perps and where they meet the circle

consider right triangles, it is not difficult to show that

$$\displaystyle \tan B + \tan C = \frac{a}{p}$$

etc.

1 person

#### cooldudeachyut

Thanks, I figured it out. I was just not using the property that equal chords subtend equal angle at the circumference.

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