GEO: 8-5 QC ... Part 2 (Law of Cosines)
B

1. Determine whether ∆ABC should be solved

    using Law of Sines of Law of Cosines.

A
a=19
63ο
b=20
C

Law of Cosines

Law of Sines

2. Find the missing lengths in the given triangle.
   (angles to the nearest degree, sides to the 
    nearest hundredth)
B

A

19
63ο
20
C
<A =

<B =

c =
ο
ο

3. Determine whether ∆ABC should be solved

    using Law of Sines of Law of Cosines.

B
a=10.5
A
72ο
b=9
C

Law of Cosines

Law of Sines

4. Find the measure of angle B.  Round to the     nearest whole degree.
B
A
degrees
C
5. To find x, would you use the law of sines
     or the law of cosines?
law of sines
law of cosines
6.  Find x and then find angle E.  
    (both to the nearest degree)
E
F
∡x = 
∡E = 
G
*Figure not
  drawn to scale.
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