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14-05-2021
Mathematics

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Choose which method to use: Law of Sines or Use Law of Cosines.

Choose which method to use Law of Sines or Use Law of Cosines class=

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14-05-2021

Answer:

we have

b=3mm

c=5mm

a=?

angle =62°

By using cosine rule.

a²=b²+c²-2bc cos angle

a²=3²+5²-2×3×5 cos 62°

a²=19.92

a=√19.92

a=4.5

I had choose cosine rule.

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