In triangle ABC the line :CD is altitude on :AB,if the point : P is on the side :CD. the line AP intersect :CB in the point :Q and the line: BP intersect CA in the point :R

how to prove that angle RDC= angle QDC?

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- Jul 9th 2012, 11:47 AMMhmh96Proving that two angles are equal
In triangle ABC the line :CD is altitude on :AB,if the point : P is on the side :CD. the line AP intersect :CB in the point :Q and the line: BP intersect CA in the point :R

how to prove that angle RDC= angle QDC? - Jul 9th 2012, 02:13 PMemakarovRe: Proving that two angles are equal
The book "Challenging Problems in Geometry" by Posamentier and Salkind, part of which is available in Google books, has this question as problem 8-25 on p. 41. It suggests proving this fact using Ceva's theorem. A solution using this theorem, as well as a couple of other solutions, is available here on Yahoo answers.

- Jul 9th 2012, 03:28 PMMhmh96Re: Proving that two angles are equal
That is help ,thank you

- Jul 10th 2012, 03:10 PMMhmh96Re: Proving that two angles are equal
Is there a way to prove that by using trigonometry ?