# congruent triangles

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• May 27th 2014, 08:43 PM
kastamonu
congruent triangles
View image: yenikelebek

• May 28th 2014, 06:44 AM
bjhopper
Re: congruent triangles
Quote:

Originally Posted by kastamonu
View image: yenikelebek

use the tangent property of a right triangle to find the unknown angle
• May 28th 2014, 07:02 AM
kastamonu
Re: congruent triangles
How?Which line do I have to draw?
• May 28th 2014, 08:18 AM
Plato
Re: congruent triangles
Quote:

Originally Posted by kastamonu
View image: yenikelebek

Are you very very sure that you have given us all the relevant information.
Have you stated the actual problem is its exact wording?
I think that you have put us down into the middle of a proof.
• May 28th 2014, 08:43 AM
bjhopper
Re: congruent triangles
There is sufficient information to solve this problem. Answer is 63.4 degrees
• May 28th 2014, 08:44 AM
kastamonu
Re: congruent triangles
Yes I did. It has something to do with congruent triangles. We have to draw a line.
• May 28th 2014, 08:45 AM
kastamonu
Re: congruent triangles
Maybe we have to create an isosceles triangle. Angle is 40 degrees.
• May 28th 2014, 08:49 AM
Plato
Re: congruent triangles
Quote:

Originally Posted by kastamonu
Yes I did. It has something to do with congruent triangles. We have to draw a line.

Please give us the actual problem in its exact wording.
• May 28th 2014, 09:14 AM
kastamonu
Re: congruent triangles
It is in Turkish.
• May 28th 2014, 09:15 AM
kastamonu
Re: congruent triangles
I translated it word by word. I also sent a mail to the author.
• May 28th 2014, 09:27 AM
kastamonu
Re: congruent triangles
View image: kelebek2 here it is.
• May 28th 2014, 10:22 AM
bjhopper
Re: congruent triangles
My answer was based on angle ABE of 30 deg.If it is 40 deg I do not see a solution with out further info
• May 28th 2014, 01:45 PM
bjhopper
Re: congruent triangles
In further review I have come up with 79.3 degrees for the unknown angle When I drew a diagram I found that CD was very close to a side of the equilateral triangle and decided that the angle could be calculated
1 find the length of AE using 8 as a side of equilateral .Altitude of AEC and segments on AC calculate using angles of 20 and60