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In this lesson, we will learn how to find the sides and angles in non-right triangles using the law of cosines.

Q1:

π΄ π΅ πΆ is a triangle where π β π = 2 2 cm, π β π = 3 2 cm, π β π = 8 cm and 2 π = π + π + π . Find the largest angle in the triangle giving the answer to the nearest second.

Q2:

π π π is a triangle where the ratio between s i n π , s i n π and s i n π is 2 3 βΆ 1 9 βΆ 1 6 . Find the smallest angle in π π π giving the answer to the nearest second.

Q3:

Which rule could be used to find the length of an unknown side of a triangle, given the other two lengths and the measure of their included angle.

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