Triangle ABC is rectangular. BC = 4 cm, angle A = 30 degrees. Find AB.
| November 29, 2020 | education
If triangle ABC is rectangular, and one of its acute angles is 30 degrees, then by the theorem: The side opposite the angle = 30 degrees, then it is equal to half the hypotenuse.
It turns out that BC is the side opposite to the angle = 30 degrees, therefore, it is equal to half the hypotenuse.
So AB = 2BC.
AB = 2 * 4 = 8 cm
Answer: 8 cm
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