Maths equations

A list of maths equations -GCSE level😕😕

Area of a square, rectangle and parallelogram

bh

Area of a trapezium

h(a+b)/2

Area of a triangle

½bh

Area of a circle

πr²

Area of a sector

θ/360πr²

Circumference of a circle

2πr

Length of an arc

θ/360πd

multiplier

100±percentage/100

Compound interest

Amount= initial amount x multiplierⁿ

Simple interest

percentage x amount x years

Percentage change

Actual amount/original amount x 100

Sum of interior angles of an n-sided polygon

(n-2)180°

Exterior angle of an n-sided polygon

360/number of sides

Pythagoras' theorem

c²= a²+b²

Volume of a prism

Area of cross section x length

Linear equation

y= mx+c

Gradient

change in y/ change in x

Midpoint of a line segment

(x₁ + x₂ /2 , y₁ + y₂/2)

Quadratic equation

ax²+bx+c

Circle graph

x²+y² = r²

Volume of a cylinder

πr²h

Surface area of a cylinder

2πr²+2πrh

Volume of a pyramid

1/3 x base area x height

Surface area of a pyramid

Area of base + area of all other sides

Volume of a cone

1/3πr²h

Curved surface area on a cone

πrL

Surface area of a cone

πrL + πr²

Density

Mass/volume

Pressure

Force/area

Speed

Distance/time