Posted by **Watson** on Monday, April 22, 2013 at 10:03am.

An equilateral triangle ABC has AB=20√3. P is a point

placed in triangle ABC and D,E and F are the foot of the

perpendiculars from P to AB, BC and AC, respectively. If

PD=9 and PE=10, what is the value of the length of PF? Please work the complete solution.

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