Section 6 - Pythagoras And Trigonometry Flashcards
(13 cards)
What is the sin cos tan word
SOHCAHTOA
When do you use sin/cos/tan minus
When trying to work out the angle
When do you not use sohcahtoa
When the triangles not a right angle triangle
What formula can you use when you know 2 sides and the angle between them
Area of triangle = 1/2 ab sin c
When do you use sine rule
2 angles plus any side
2 sides plus angle not enclosed by them
When to use cosine rule
2 sides plus enclosed angle
All 3 sides but no angle
Sine rule
A/sin A = b/sin b = c/sinc
What happens when you multiply a vector by a positive number
It changes size but not direction
What happens when you multiply a vector by a negative number
The direction gets switched and the number gets bigger
What does a + b mean for vectors
Go along a then b
What should you do when adding column vectors
Add top to the top and bottom to the bottom
Cosine form for finding an angle
Cos a = b² + c² - a²
————-
2bc
How to use normal sohcahtoa
Label all the sides hypotenuse, opposite and adjacent according to the angle ur using / finding
The 2 sides u know u find in sohcahtoa
Depending on what u r finding either find that or do the inverse
