Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 2)
If the cosine of an angle is 0.8, what is the ratio of the adjacent side to the hypotenuse?
0.2
0.6
0.8
1.0
Giải thích
The cosine of an angle is defined as Adjacent/Hypotenuse, and in this case, it's given as 0.8.