Determine the spherical excess of the spherical triangle ABC given a = 56°, b = 65°, and c = 78°.

 Determine the spherical excess of the spherical triangle ABC given a = 56°, b = 65°, and c = 78°.

A). 33°33™

B). 38°93™

C). 68°37™

D). 90°57™

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