Flashcards in Formulas Deck (30)

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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