Formulas Flashcards
Area of a parallelogram?
Base x Height
Area of a triangle?
1/2Base x Height
Area of a trapezium?
1/2(a+b)h
Half the sum of the parallel sides times the distance between them, that’s how you calculate the area of a trapezium
Circumference?
Pi x diameter
Or
2 x Pi x Radius
Area of a circle?
Pi x Radius squared
Pythagoras’ theorem?
Only for right angle triangles
A squared + B squared = C squared
Quadratic equation
AX^2 + Bx + C = 0
-b+/- _/(b^2-4ac)
___________________
2a
Volume of a cuboid
Length x width x height
Volume of a prism
Area of cross section x length
Volume of a cylinder
Pi x Radius squared x height
Volume of a pyramid
1/3 x area of base x height
Speed
Distance
_________
Time
Density
Mass
_______
Volume
Pressure
Force
______
Area
Sine rule
a b c
______ = ______ = ______
Sin A Sin B Sin C
Cosine rule
a^2 = b^2 + c^2 - 2bc x Cos A
Area of triangle with trig
1/2 ab x Sin c
3D Pythagoras
Width^2 + height^2 + depth^2 = diagonal^2
What do you use to work out a right angle triangle (in trig)
Soh cah toa
How do you find missing angles using trig?
Inverse sin cos & tan
Rules of bearings
Measure clockwise
Put 0 before number of needed (001, 067, 978)
When do we use the sine rule?
The triangle isn’t a right angle
When you know a side and it’s opposite angle
Right angled triangle uses…
Sohcahtoa
OR
Pythagoras
NOT right angle triangle
You KNOW a side and it’s opposite angle
Sine rule
NOT a right angle triangle
You don’t know a side and it’s opposite angle
Cosine rule
How do you work out the enlarged area of a shape
Original area x SF^2
How do you work out the enlarged volume
Original volume x SF^3
In probability, the word AND means…
Probabilities are MULTIPLIED
In probability the word OR means…
the probabilities are ADDED
nth term
Difference x n + zero term
