Law of Cosines Problems - easy

Problem №1

In a triangle ABC, AC=3, BC=5, AB=6. Find $\cos(\angle ACB)$ .
In the answer box, write the fraction as a/b. If it is negative, write '-' directly before the fraction.

Problem №2

Given a triangle ABC with AC=12, BC=10 and $\angle ACB = 60^\circ$ , find the value of AB^2.

Problem №3

Given a triangle ABC with AC=17, BC=14 and $\angle ACB = 60^\circ$ , find the value of AB^2.

Problem №4

Given a triangle ABC with AC=22, BC=21 and $\angle ACB = 60^\circ$ , find the value of AB^2.

Problem №5

Given a triangle ABC with AC=8, BC=6 and $\angle ACB = 60^\circ$ , find the value of AB^2.

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