Question

Using the Law of Sine or Cosine, solve for the unknown variable (round to the

Answer 1

Law of Sines always came easier to me since it was just simple cross multiplication.

The formula consists of a/sinA=b/sinB=c/sinC.

However, this one cannot be used for Law of Sines because one more angle isn't given. So off we go to Law of Cosines.

This one is simpler. The formula is  c^2 = a^2 + b^2 − 2ab cos(C)

This one is easier to do. Let's designate all sides a variable. Let's just say 47 is a, 56 is b, and c is x.

Let's fill in the numbers

c^2=47^2+56^2-2(47)(56)cos124

c^2=2209+3136-(5264cos124)

c^2=5245-(-2895.2)

c^2=5245+2895.2

c=90.22