In triangle ABC, angle C is 90 °, AC = 9, cosA = 0.3. Find AB.
| February 10, 2021 | education
1. In a right-angled triangle ABC, side AB is the hypotenuse, the leg AC is adjacent to the angle A, the cosine of which is 0.3.
2. AC / AB = cosine of angle A = 0.3.
AB = AC: 0.3 = 9: 0.3 = 30 units.
Answer: The length of the side AB of the triangle ABC is 30 units.
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