maths equations Flashcards
1
Q
the volume of a sphere
A
4/3πr³
2
Q
the surface area of a sphere
A
4πr²
3
Q
the volume of a cone
A
1/3πr²h
4
Q
curved surface area of a cone
A
πrl
5
Q
compound growth and decay
A
N = N(multiplier)
6
Q
area of a trapezium
A
1/2h(a + b)
7
Q
quadratic equation
A
x=−b±√b²−4ac
2a
8
Q
Pythagoras theorem
A
a² + b² = c²
9
Q
Sine rule
A
a = b = c
sin A sin B sin C
10
Q
cosine
A
a² = b² + c² - 2bcCOS A
11
Q
area of a triangle
A
1/2ab sin C
12
Q
speed
A
speed = distance / time
13
Q
density
A
density = mass / volume
14
Q
pressure
A
pressure = force / area
