You have to split it into triangles
but you have to know how to use pythagorus in 3D shapes
The numbers are 15,18
They add to 33 and a difference of 3
You would subtract x from each side. It would then be 3y=-x-15. Then you would divide all of the equation by 3. Your final answer would be y=-3x-5.
Is this homework or classwork?
It has a rotational symmetry of 6
So minimum number of degrees = 360 / 6
= 60 degrees