Key learning points

1. The sine ratio involves the hypotenuse, opposite and the angle
2. If you know the length of the hypotenuse and the size of the angle, you can use the sine ratio
3. If you know the length of the opposite and the size of the angle, you can use the sine ratio
4. If you know the length of the hypotenuse and opposite, you can use the sine ratio

Keywords

• Hypotenuse - The hypotenuse is the side of a right-angled triangle which is opposite the right angle.

• Opposite - The opposite side of a right-angled triangle is the side which is opposite the marked angle.

• Trigonometric functions - Trigonometric functions are commonly defined as ratios of two sides of a right-angled triangle for a given angle.

• Sine function - The sine of an angle (sin(θ°)) is the y-coordinate of point P on the triangle formed inside the unit circle.

Common misconception