Answer:
The tangent ratio is used for right triangles.
Explanation:
We have been given an incomplete statement. We are supposed to fill in the given blank for statement using correct option.
Statement:
The tangent ratio is used for _ triangles.
We know that tangent is a trigonometric ratio, which represent relation between opposite side of right triangle to its adjacent side.
Therefore, the correct term for our given statement is 'right' and option C is the correct choice.