Since this is a right triangle, we know c = 90. The sum of a+b must also be 90, since a+b+c = 180 A = 1ft, C = 3ft. B is unknown. We can calculate B using the pythagorean theorem. 1^2 + b^2 = 3^2 1 + b^2 = 9 b^2 = 8 b = 2sqrt2 Angle a = 1/3 = about 19.5 degress Angle b = 2sqrt2/3 = 70.5 degress Angle c = 90 degrees