In a right-angled triangle ABC, angle C = 90 degrees, angle B = 60 degrees, side AB = 15cm. Find BC?
| September 20, 2021 | education
Because in a right-angled triangle, the sum of two acute angles is 90 °, then we find the value of angle A.
∠А = 90 ° – 60 ° = 30 °.
In a right-angled triangle, the leg, opposite an angle of 30 °, is equal to half the hypotenuse.
So the leg BC = ½ AB.
BC = ½ * 15 = 7.5 (cm).
Answer: BC leg = 7.5 cm.
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