Which equation could be used to solve for the length of side c, given a = 5, b = 12, and c = 72°?

Question

Mathematics

Eric Pollard

1 July, 15:35

Which equation could be used to solve for the length of side c, given a = 5, b = 12, and c = 72°?

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Answers (1)

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Ally Kemp · Answer 1

C^2=a^2+b^2-2abcos (c)

c=sqrt (a^2+b^2-2abcos (c))

c=sqrt ((5) ^2 + (12) ^2-2 (5) (12) cos (72))

c=sqrt (25+144-120cos (72))

c=sqrt (169-120cos (72))

c=sqrt (169-37.08)

c=sqrt (131.92)

c=11.49