GCSE Maths

Sine (sin)

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

RAT with 30 degree angle

Sin 30° will always equal 0·5, when applied to right angle triangles. Now let's see how we use those pesky calculators...

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