3. Geometry and Trigonometry

Cosine Rule — Quiz

Test your understanding of cosine rule with 5 practice questions.

Practice Questions

Question 1

Which formula is the cosine rule for a triangle with side $c$ opposite angle $C$?

Question 2

In a triangle, $a=5$, $b=7$, and $C=60^\circ$. What is $c$?

Question 3

In a triangle, $a=6$, $b=8$, and $c=10$. What is angle $C$?

Question 4

Which data set is enough to use the cosine rule to find a missing side?

Question 5

In a triangle, $a=9$, $b=3$, and $C=60^\circ$. What is $c$?