Trigonometry is used for calculations involving angles and triangles.

You may have heard of the 'Pythagorean Theorem' and 'sine, cosine & tan'?

Trigonometry is used in many industries, including construction.

**Work through the modules under the drop down arrow above to improve your understanding of trigonometry.**

N.B. Scientific calculators include **'sin,' 'cos' **& **'tan' **buttons which are required for some calculations involving trigonometry.

- Online scientific calculator from Calculator.netTo open the scientific calculator in a new window, you MUST click the link.

**Click the link & scroll** to find tutorials on **your calculator's particular brand... **

https://www.youtube.com/c/HDCalcs/video

For example, **watch the video below** from HD Calcs on how to use trigonometric functions.

The video above explains how to use basic trig functions on a Casio fx-991 calculator.

0.44 min - setting up 'degree' mode

1.19 min - find an unknown side length

- SOS Math forumOnline 24/7 maths assistance for algebra and higher.
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