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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 is1.2254.

Can someone please tell me what to do, thanks.

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# Homework Help: How to find the surface area of a spherical triangle?

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