Question

Sin∅=3/5, then cos∅=_____

Answer 1

4/5.

Explanation:

The right triangle with this angle in it has sides 3, 4 and 5. ( 5^2 = 3^2 + 4^2).

So as sin∅ = 3/5, the opposite side to angle ∅ is 3 , the hypotenuse is 5 and the adjacent side must be 4 units long.

So cos∅ = adjacent side/hypotenuse = 4/5.