How much bigger is B than A , so Side length B- A = (-4x+18) - (2x-7) = -6x+25 So perimeter = 4x length = 4x(-6x+25) = -24x+100 = 100-24x How much bigger? 100-24X
We can use two different methods to find our missing angle: Subtract the two known angles from 180° : Plug the two angles into the formula and use algebra: a + b + c = 180°