In a triangle ABC, the angle C is 90 AC = 5, cosA = 1/3. Find AB.

univerkov | December 30, 2020 | education

Given:
AC = 5
СosA = 1/3
AB-?
Decision
Cosine is the ratio of the leg adjacent to the angle, to the hypotenuse
СosA = AC / AB
1/3 = AC / AB
1/3 = 5 / AB
AB = 5 × 3 = 15

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