The correct answer for the completion exercise shown above is: sine.
Therefore, the complete text is shown below: "In a right triangle, the sine of an angle can be found by dividing the length of the opposite leg by the length of the triangle's hypotenuse".
A right triangle is a triangle that has an angle of 90 degrees.
The sine is one of the most common trigonometric functions. Therefore, you have that the sine of an angle is:
Sin(α)=opposite/hypotenuse
