In a triangle ABC, AB = 3 cm, AC = 4 cm, BC = 5 cm. Which of the angles of the triangle is the largest?

We apply one of the rules for the ratio of angles and sides in a triangle: the larger side is located opposite the larger angle, and vice versa, the larger angle is located opposite the larger side.

Opposite the angle <A, the side BC = 5 cm is located, which means <A is the largest. Opposite <B is the AC side = 4 cm, which means <B is less than <A. The side AB = 3 cm is located opposite the angle <С, which means that <С is the smallest.