1
Pi (π)
3.14
2
Circumference of a circle
πd (3.14 x diameter)
3
Area of a circle
πr2 (3.14 x radius squared)
4
Perimeter of a square
side + side + side + side
4s
5
Area of a square
s2
s x s
6
Perimeter of a rectangle
2length + 2width
l + l + w + w
7
Area of a rectangle
lw
l x w
8
Perimeter of a triangle
s + s + s
9
Area of a triangle
1/2 base x height
bh/2
10
Surface area of a cylinder
2πr2 (2 x 3.14 x radius squared) + 2πrh (2 x 3.14 x radius x height)
11
Volume of a cylinder
πr2h (3.14 x radius squared x height)
12
Surface area of a rectangular prism
2(lw) + 2(lh) + 2(wh)
13
Volume of a rectangular prism
lwh
l x w x h
14
Volume of a cone
1/3 πr2h (3.14 x radius squared x height)