Thread: 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?

but what about the area?

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

Can somone please help?

Thx

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?

but what about the area?

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

Can somone please help?

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?

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?