26/05/2025
Today's Topic: Trigonometry
As most of you are on Intermediate, I'll stick to right angle triangles. If anyone needs non right angle triangles please let.me.know
Also: remember that soh cah toa is not included in the formula sheet, so it needs to be memorised.
So Quick summary: how to find a missing side when you have an angle and one side
1) draw your soh cah toa triangles (see image)
2) label your hypotenuse adjacent and opposite (see image).
3) check which side you have and which do you need and use this to select which sohcahtoa triangle you need
4) cover side you are looking for to find.your calculation.
eg if you have H and need O. On soh cover the O and you will see you need sin(x) times H
5) pop that into a calculator to ger your answer
When your comfortable with that, use it to find the missing angle from 2 sides. But remember to use the inverse sin tan and cos buttons instead (the ones with -1 on it)
If you need a more detailed explanation, have a look at find the missing side:
https://youtu.be/F_uTDZtRe0I?si=b9BXW6wBzXGUNGg2
And find the missing angle:
https://youtu.be/I2MpcUZNQD0?si=IaR1Z3URqDVVejku
Lastly, for practice with immediate feedback, here is the usual reliable transum.link...
https://www.transum.org/Maths/Exercise/Trigonometry/Default.asp?Level=7
Nearly there all, just a few more weeks to.go