On the sphere we showed that T, the area of a nondegenerate spherical triangle, equals r² (angle sum - pi). Which of the following are consequences of this result [T= r² (angle sum - pi)]:
a) The angle sum of a nondegenerate spherical triangle must be larger than 180 degreees, and I have a good reason why.
b) The angle sum of a nondegenerate spherical triangle must be larger than 180 degreees, but I am unsure of why.
c) AAA implies congruence on the sphere for nondegenerate triangles, and I have a good reason why.
d) Both a) and c)
e) Other