i dont know what this angle on my paralellpiped is. basicallt just a trapazoid extruded on an angle. but also half of the front face is pushed back. i need to no what angle it is pushed back. dimensions are: 10 by 8 with 120 60 degress (front n back face) 10 by 6 with 120 n 60 degress (sides) 6 by 8 with 135 n 45 degrees (top n bottom) specificly i want to find the plotting points on a 3 dimensional plane (x y z). where the front faces has the lower left most point as the origin. i need to find out what the points would be for the back face.