How to use law of cosines for SSS

The video tutorial explains how to find the angles of a triangle given its sides using trigonometric laws. It starts by identifying the need to find angles in a side-side-side triangle and choosing the angle opposite the longest side to calculate first. The law of cosines is applied to find angle B, which is obtuse. Then, the law of sines is used to find angle A, and finally, angle C is calculated by subtracting the sum of angles A and B from 180 degrees.

What is the first angle that should be found in a triangle when using the law of cosines?

Explain how to apply the law of cosines to find angle B in the given triangle.

What values are used in the law of cosines formula to find angle B?

What is the significance of knowing that angle B is obtuse?

How do you calculate the sine of angle A using the law of sines?

Describe the process of finding angle A after determining angle B.

What is the final value of angle C after calculating angles A and B?