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1

Area of a parallelogram?

Base x Height

2

Area of a triangle?

1/2Base x Height

3

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

4

Circumference?

Pi x diameter
Or
2 x Pi x Radius

5

Area of a circle?

Pi x Radius squared

6

Pythagoras' theorem?

Only for right angle triangles

A squared + B squared = C squared

7

Quadratic equation
AX^2 + Bx + C = 0

-b+/- _/(b^2-4ac)
___________________
2a

8

Volume of a cuboid

Length x width x height

9

Volume of a prism

Area of cross section x length

10

Volume of a cylinder

Pi x Radius squared x height

11

Volume of a pyramid

1/3 x area of base x height

12

Speed

Distance
_________

Time

13

Density

Mass
_______

Volume

14

Pressure

Force
______

Area

15

Sine rule

a b c
______ = ______ = ______
Sin A Sin B Sin C

16

Cosine rule

a^2 = b^2 + c^2 - 2bc x Cos A

17

Area of triangle with trig

1/2 ab x Sin c

18

3D Pythagoras

Width^2 + height^2 + depth^2 = diagonal^2

19

What do you use to work out a right angle triangle (in trig)

Soh cah toa

20

How do you find missing angles using trig?

Inverse sin cos & tan

21

Rules of bearings

Measure clockwise
Put 0 before number of needed (001, 067, 978)

22

When do we use the sine rule?

The triangle isn't a right angle
When you know a side and it's opposite angle

23

Right angled triangle uses...

Sohcahtoa
OR
Pythagoras

24

NOT right angle triangle
You KNOW a side and it's opposite angle

Sine rule

25

NOT a right angle triangle
You don't know a side and it's opposite angle

Cosine rule

26

How do you work out the enlarged area of a shape

Original area x SF^2

27

How do you work out the enlarged volume

Original volume x SF^3

28

In probability, the word AND means...

Probabilities are MULTIPLIED

29

In probability the word OR means...

the probabilities are ADDED

30

nth term

Difference x n + zero term