Sin - As we all should know that sin is a trigonometrical function which says that sin = opposite / hypotenuse
Cos - As we all should know that cos is equal to cos = base of the triangle / hypotenuse
Tan - As we all should know that tan is equal to the formula of tan = opposite / the base of the triangle
What is Trigonometry?
Trigonometry is the mathematics of angles in triangles
It looks at the relationship between side lengths and angles of triangles
It comes from the Greek words trigonon meaning ‘triangle’ and matron meaning ‘measure’
What are sin , cos and tan ?
The three trigonometric functions Sine, Cosine and Tangent come from ratios of side lengths in right-angled triangles
To see how the ratios work you must first label the sides of a right-angled triangle in relation to a chosen angle
The hypotenuse, H, is the longest side in a right-angled triangle
It will always be opposite the right angle
If we label one of the other angles θ, the side opposite θ will be labelled opposite, O, and the side next to θ will be labelled adjacent, A
The functions Sine, Cosine and Tangent are the ratios of the lengths of these sides as follows
What is SOHCAHTOA?
SOHCAHTOA is is a mnemonic that is often used as a way of remembering which ratio is which
Sin is Opposite over Hypotenuse
Cos is Adjacent over Hypotenuse
Tan is Opposite over Adjacent
Very good