# Fundamental Trigonometry - help

• Feb 1st 2010, 11:24 AM
Darkplayer
Fundamental Trigonometry - help
I'm trying to solve this problem: Attachment 15152

I want to find teh angle D and the area of the parallelogram.

I'm not sure, but using the cosinusrelations i get that angle D is 103,14?

I'm also having trouble finding the angle BCA and the length EC.

Thx (Wink)
• Feb 1st 2010, 11:36 AM
Henryt999
Quote:

Originally Posted by Darkplayer
I'm trying to solve this problem: Attachment 15152

I want to find teh angle D and the area of the parallelogram.

I'm not sure, but using the cosinusrelations i get that angle D is 103,14?

I'm also having trouble finding the angle BCA and the length EC.

Thx (Wink)

If you know the cosine relation and you know that it is a parallelogram that BCA should be a piece of cake? You have 3 sides just do the relations again to find that angle.
To find the area you know the sin formula for that?
• Feb 1st 2010, 11:52 AM
Darkplayer
Quote:

Originally Posted by Henryt999
If you know the cosine relation and you know that it is a parallelogram that BCA should be a piece of cake? You have 3 sides just do the relations again to find that angle.
To find the area you know the sin formula for that?

Is my answer right so far?