# Thread: Fundamental Trigonometry - help

1. ## Fundamental Trigonometry - help

I'm trying to solve this problem:

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

2. Originally Posted by Darkplayer
I'm trying to solve this problem:

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
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?

3. 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?