In a right-angled triangle ABC, angle C = 90 ° B = 60 ° AB = 15cm, find side BC.
| February 22, 2021 | education
In this triangle, side AB is the hypotenuse, side BC is the leg adjacent to the angle B. Since the ratio of the adjacent leg to the hypotenuse is the cosine of the angle, we can write: cos B = BC / AB. From here we can find the aircraft:
BC = AB * cosB = AB * cos60 = 15 * 0.5 = 7.5 cm.
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