Easy

Law of Cosines - Problems with Solutions

Problem 1
In a triangle ABC, AC=3, BC=5, AB=6. Find [tex]\cos(\angle ACB)[/tex].
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 [tex]\angle ACB = 60^\circ [/tex], find the value of AB2 = ?.
Problem 3
Given a triangle ABC with AC=17, BC=14 and [tex]\angle ACB = 60^\circ [/tex], find the value of AB2 = ?.
Problem 4
Given a triangle ABC with AC=22, BC=21 and [tex]\angle ACB = 60^\circ [/tex], find the value of AB2 = ?.
Problem 5
Given a triangle ABC with AC=8, BC=6 and [tex]\angle ACB = 60^\circ [/tex], find the value of AB2 = ?.
Easy
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