Rules And Formulas Flashcards
1
Q
Sine rule to find lengths
A
a/SinA = b/SinB = c/SinC
Lengths on top
2
Q
Sine rule to find angles
A
SinA/a = SinB/b = SinC/c
Angles on top
3
Q
Cosine rule when you know 2 sides and angle in between
A
a^2 = b^2 + c^2 - 2bcCosA
4
Q
Cosine rule when you know 3 side lengths
A
CosA = (b^2 + c^2 - a^2) / 2bc
5
Q
Equation of a circle
A
x^2 + y^2 = r^2
6
Q
Equation of a straight line
A
y = mx + c
7
Q
Surface area of a sphere
A
4πr^2
8
Q
Volume of a sphere
A
4/3πr^3
9
Q
Volume of a pyramid
A
1/3 of area of base x vertical height
10
Q
Surface area of a cone
A
πrl + πr^2
l = slant length
11
Q
Volume of a cone
A
1/3πr^2 x height
12
Q
Area of a trapezium
A
1/2(a + b)h
13
Q
Area of a triangle
A
1/2(h x b)
Or
1/2abSinC
14
Q
Area of a parallelogram
A
h x b
15
Q
Quadratic formula
A
x = [-b +-(square root of b^2 - 4ac)] / 2a
