Question

Using the following triangle, which of the following expressions would result in the measure of triangle A.

A. Sin-1(6/8)
B. Cos-1(6/10)
C. Tan-1(6/8)

Answer 1

As you want to find angle A
Just get to know one thing that
The two given lengths 6,8  are opposite side and adjacent side
so angle A can be get by tan(A)
so Angle A = tan-1(6/8)