The law of cosines for RST can be set up as 52 = 72 + 32 - 2 (7) (3) cos (S). What could be true about RST?

Law of cosines: a2 = b2 + c2 - 2bccos (A)

r = 5 and t = 7

r = 3 and t = 3

s = 7 and t = 5

s = 5 and t = 3

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