Question

right triangle, adjacent, hypotenuse *
cosine
x right triangle, opposite, right angle *
tangent
√ sine, cosine, tangent *
trigonometric ratios

Explanation:

Answer:

Sine
The correct match for "Right Triangle, Opposite, Right Angle" is Sine, since $\sin\theta = \frac{\text{Opposite}}{\text{Hypotenuse}}$ (hypotenuse is opposite the right angle)