compound angles

[ryno fab]

Anybody know how to figure out compound angles without doing a bunch of math? or using cad.

so lets say im doing a truck bumper. i have the front piece that is going across the front of the truck about two feet long in front of the radiator. then i take a piece at the same the same plane and bend it back 15 degrees twards the headlight . the sated angle of course is 7.5. now i want to take a two inch " strip" and run it along the top. instead of it being on plane with the face i want it tipped back into the grill. im sure you all have seen it on an aftermarket bumper. for simplicity (for me, not you) i will call the 15 degrees the base angle and the 45 the tilt angle. the angle in question is the angle on the 2 in strip that has a base angle of 15 and a tilt angle of 45. the compound angle. my question is: is there a chart or rule of thumb to find this angle? i realize i could do the math involving sinA -cosB = bla bla bla. i dont want to. i can do it faster with cardboard templates. just looking for something with a base angle input; 15, 45, 22.5, 90 , 30 and a tilt angle input ; 45 ,30 , 15 that will give me the compound angle. this would be the overall angle, even on both sides. not like the 90 on one and the other angle diving into it. as the angles are even and both parts are the same i think this shouldnt be that complicated. there has to be a better way. i also found tons of comp angle calculators for wood. molding and flower pot stuff. no thanks. there has to be some shade tree welder trick out there.