Trigonometric Formulae + Flashcards
What is the Sine Rule
a over sinA = b over sinB = c over sinC
to find a side- other way up to get the sine of an angle
What is the cosine rule
a= b+c*-2bc cosA
*= squared
How do you work out the area of a triangle
1/2ab sinC
When would you use the sine rule
When you have 2 angles and 1 side
Or 2 sides and 1 angle
When would you use the cosine rule
When you only have 1 angle
What is the quadratic equation
X= -b +/- |(b*-4ac)
All over 2a
Where | means square root and *means squared
When do you use the quadratic equation
When you cannot factorise
What is frequency in a histogram
Frequency = frequency density X class width
What does this mean in a Venn diagram
A n B
Everything in both A AND B ( the intersect)
n for and
What does this mean in a Venn diagram
A u B
The union of A and B
So anything in A or B
What does this mean in a Venn diagram
A’
The complement on A
Everything NOT in A
