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3 years ago

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

Mathematics

2 answers:

dolphi86 [110]3 years ago

7 0

Answer:

law of cosines

c^2=(5)^2+(12)^2-2(5)(12)cos72

DedPeter [7]3 years ago

4 0

Answer:

i had this question before

Step-by-step explanation:

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

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From the equations shown, last answer choice is correct.

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