# Cosine Law

Find all missing sides/angles. Round each answer to the nearest unit.
Angles/sides ABC (left to right)

1) Angle c= 70 deg
side b= 28 yd
side c= 26 yd

2) Side a= 18 cm
Side b= 24 cm
Side c= 28 cm

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1. sinB/b = sinC/c
that will get you B
Then A+B+C=180 gets you A

a^2 = b^2+c^2 - 2bc cosA
gets you A. Then,
b/sinB = c/sinC = a/sinA gets you A and B

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posted by Steve

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