Starter Quiz
Question 1 of 6
1
of 6
Which of the following is the cosine rule?
Select 2 answers
$$a^2+b^2=c^2$$
$$\frac{a}{\sin(A)}=\frac{b}{\sin(B)}=\frac{c}{\sin(C)}$$
$$a^2 = b^2+c^2-2bc\cos(A)$$
$$\frac{1}{2}ab\sin(C)$$
$$ \cos(A) = \frac{b^2+c^2 - a^2}{2bc}$$
The cosine rule will use cosine in its formula or rule.
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