alleryStart learning →Two sides of a triangle are 5 and 7 with a 60° angle between them. Find the third side.
A√19
B√74
C√39
D√109
Answer & Solution
Correct answer: C. √39
c² = 25 + 49 − 2 · 5 · 7 · (1/2) = 39, so c = √39.
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