# Trigonometry presentation

This is a simple presentation with a couple of examples on it shows the simple use of trig then the inverse use Suitable for GCSE Mathematics

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• Created by: K D
• Created on: 01-05-08 22:08

## Other slides in this set

### Slide 2

Here's a taster:

What to use?
You can only use trig when you are given a
right-angled triangle with two sides and a
angle. H=Hypotenuse
side
O O=Opposite
X
side
A
X= the side or angle wanted
H=Longest side= opposite
right angle
O=Side opposite the right
angle

### Slide 3

Here's a taster:

Soh, Cah or Toa
Soh= Sin x O/H H
Cah= Cos x A/H
Toa= Tan x O/A O
X
A
Which one to use all depends on the sides
given. In this question you are given the sides H and A
therefore you will use CAH which is Cos. The answer
to the question will be Cos 48 = X/13....Therefore to
make X the subject.......
13 Multiplied by Cos 48 = X

### Slide 4

Here's a taster:

Inverse
Where the angle is not given and this is what
you have to work out you need to do the
inverse this is either Cos-1 Tan-1 or Sin-1
This is an example of where this is needed. So... the
two sides given is Opposite and Adjacent therefore
we are doing TOA which is Tan..........
Tan X= O/A
Tan X= 24/13 Remember to always make X the
subject
X= Tan-1 24/13
Remember to do the divide first then do the inverse
of tan