# Maths formulae

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• Created by: SianTate
• Created on: 12-05-16 13:13
Stratified Sampling
Group size / total population size X Sample size
1 of 19
Frequency Density
Frequency / Class width
2 of 19
Cumulative frequency
Add the frequencies together as you go along
3 of 19
Arc length
Angle of arc / 360 X πd
4 of 19
Area of a sector
Angle of a sector / 360 X πr²
5 of 19
Exterior angle
360 / Number of sides
6 of 19
5 Miles = ...Km
8Km
7 of 19
1 Inch = ....cm
2.5cm
8 of 19
Speed
Distance / Time taken
9 of 19
Distance
Speed X Time
10 of 19
Time
Distance/Time
11 of 19
Density
Mass / Volume
12 of 19
Mass
Density X Volume
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Volume
Mass / Density
14 of 19
Pythagoras (Hypotenuse)
A²=B²+C²
15 of 19
Pythagoras (short side)
A²=B²-C²
16 of 19
Sin (SOH)
Opposite / Hypotenuse
17 of 19
Cos (CAH)
18 of 19
Tan (TOA)
19 of 19

## Other cards in this set

### Card 2

#### Front

Frequency Density

#### Back

Frequency / Class width

### Card 3

#### Front

Cumulative frequency

Arc length

Area of a sector