my set of mathematics (deck 1)

Area of a triangle

(base × height) divided by 2

Area of a rectangle

length × width

Kg to pounds

Multiply by 2.2

Area of a parallelogram

base × height

Area of a trapezium

(top+ bottom line) (× height) divided by 2

Area of a circle

pi × r squared

Circumference of a circle

2 × pi × r or pi × d

Volume of a cube or cuboid

length × width × height

Percentage change

Change x 100 divided by original

Volume of a prism

area of cross-section × length

Pythagoras’ Theorem

a squared + b squared = c squared

Only on right angled triangles

Trigonometric Ratios

sin θ = opposite ÷ hypotenuse, cos θ = adjacent ÷ hypotenuse, tan θ = opposite ÷ adjacent

Speed formula

Distance divided by Time

Mean

total of values divided by number of values

Median

Middle value when numbers are in order

Mode

Most frequent value

Range

Highest value − lowest value

Density

Mass divided by Volume

Pressure

Force divided by Area

Scale Factor

scale factor × original length

Distance formula

Speed x time

Time

Distance divide by speed

Mass formula

Density x volume

Difference of two squares (a squared - b squared)

(a + b)(a − b) (a and b can be any terms)

Angle sum in a triangle

Add up to 180

Angles on a straight line

add up to 180°

Angles around a point

add up to 360°

Base angles of an isosceles triangle

Both equal

Vertically opposite angles

opposite angles are equal

Interior angle of a polygon

(number of sides− 2) × 180°

Exterior angle of a polygon

360° ÷ number of sides

Miles to km

1 mile =1.6 kilometres

Area of a square

Side x side

Volume of a cube

Side x side x side

Perimeter of a rectangle

Length + width x 2

Surface area of a cube

6 x side squared

Volume of a cone

Pi x radius squared xheighy divided by 3

Volume of a pyramid

Length x width x height divided by 3

Volume of a sphere

4/3 x radius cubed x pi

Mm to cm to m to km

1m is 1000mm

1cm is 10mm

1m is 100cm

1km is 1000m

Force sum

Pressure x area

Area sum

Force divided by pressure

Volume of a cylinder

Pi x r squared x height

What is annual interest

Per year or month

How to find coordinates midpoint

Add both x axis than divide by 2

Add both y axis than divide by 2

LCM with product of primes

Times all the primes together

Hcf with primes

Times numbers in the middle of the Venn diagram

what is a mixed number

A big number and a fraction

Foot to cm

Multiply foot by 30.48

Annum

Per year