In right triangle ABC, angle B is 90 degrees. If tan C = 2. Find cos A. No caculator
Since tan(C) = 2 ---> AB = 2 and BC = 1 (or multiples of these numbers)
Using AB = 2 and BC = 1 and the Pythagorean Theorem, AC = sqrt(5).
Therefore, cos(A) = 2 / sqrt(5)
In the right triangle ABC, angle B is 90 degrees. If tan C = 2. Find cos A. No calculator.
tanC = 2/1 = 2
cosA = 2 / √5 = 0.894427191
