Use the diagram to derive the law of cosines. Fill in the missing statements in the derivation.
B
a
1 a² =h² + x2
2) h2 =
3) c2 = h2 + (b − x)2
4) c² = h²+
5) c2 = a2 - x2 + b2 - 2bx + x2
6) c2 = a2 + 32
7) x = acosc
8) c2 = a² + b22abcosc
h
x
b-x
С
А
b
DONE