You'll need to draw a line from the vertex between B and C, to the vertex between A and D.
You will then need to use a combination of the sine and cosine rules to find the missing sides and angles...
This might seem a simple question, but I suck at maths. I need to cut some ply to fill a gap behind my boat kitchen and I have measured the lengths of the sides. I'd like to have the angles to help me draw a decent template to cut from, but I'm not sure how.
A = 1055mm
B = 399mm
C = 860mm
D = 73mm
And the angle between D and A is a right angle.
Any help welcome.
It would help if you are working with triangles.
First draw a line from angle AB to angle CD. This will divide the shape into 2 triangles.
Solve this unknown length (call this E) by using the Pythagorus Theorum (Because it has a right angle):
(I substituted your letters into it)
Now we find the angle of BC by using the cosine rule:
To solve the angle AB, we do the same thing, but must divide it into 2 parts.
To find angle CD, we must subtract the other 3 angles by 360.