Now let's have a look at sin in use. Below is a right-angle triangle with a 30° angle marked and two sides. Recall "sohcahtoa"!
By definition, sin 30°
sin 30°
= opposite÷hypotenuse
= 4÷8
= 0·5
Sin 30° will always equal 0·5, when applied to right angle triangles. Now let's see how we use those pesky calculators...