In a right-angled triangle ABC, angle C = 90 °, angle B = 60 °, AB = 12 cm. How much will the BC side be?

Based on the condition of the problem, the side AB will be the hypotenuse of our triangle.

At the same time, the side of the BC will be adjacent to the corner B.

Let us determine what the length of the BC side will be equal to if we know from the condition of the problem that the length of the AB side is 12 centimeters:

cos 60 ° = 1/2;

12 * 1/2 = 6.

Answer: Under such initial conditions, the length of the side of the aircraft will correspond to 6 centimeters.