Hello I have a spherical triangle with the radius 1, and I have tried so hard to find the surface area. I know that A=120°, b=90° and c=60°. I could calculate that B=73.89° and C=56.31° and a=115.66°. I think I should use the formula (ABC) = (A + B + C - pi) r2 I always get the wrong answer but the correct one is 1.2254. Can someone please tell me what to do, thanks.