In the triangle ABC, the angle is c = 90 degrees, the outer angle at the vertex B is 120 degrees, AB = 18 cm. Find BC.
| March 31, 2021 | education
Outside angle + angle B = 180 °. Angle B = 180 – 120 = 60 °. Angle A = 180 – 90 – 60 = 30 °, by the property of a triangle. By the property of a right-angled triangle, SV is 2 times less than the hypotenuse, that is, the leg is 9 cm.
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