SAT Question a6097ec2: Right Triangles And Trigonometry answer and explanation with Desmos solution

Choice C is correct. The sine of an acute angle in a right triangle is the ratio of the length of the side opposite that angle to the length of the hypotenuse. In the right triangle shown, it's given that the length of the side opposite the angle with measure $x^{\circ }$ is $63$ units and the length of the hypotenuse is $73$ units. Therefore, the value of $\sin x^{\circ }$ is $\frac{63}{73}$.