For an acute angle $\theta$ of a right triangle, the sine of $\theta$ is the ratio between the lengths of the opposite side and the hypotenuse. The sine of $\theta$ is written as $\sin \theta .$ This trigonometric ratio states the ratio between the opposite side and the hypotenuse. It gives no indication about the lengths of the individual sides. It should be noted that for a given angle, when the opposite side and hypotenuse measurements change, if their ratio stays the same, then the sine, too, would stay the same.