Pi (π)

3.14

Circumference of a circle

πd (3.14 x diameter)

Area of a circle

πr2 (3.14 x radius squared)

Perimeter of a square

side + side + side + side
4s

Area of a square

s2
s x s

Perimeter of a rectangle

2length + 2width
l + l + w + w

Area of a rectangle

lw
l x w

Perimeter of a triangle

s + s + s

Area of a triangle

1/2 base x height
bh/2

Surface area of a cylinder

2πr2 (2 x 3.14 x radius squared) + 2πrh (2 x 3.14 x radius x height)

Volume of a cylinder

πr2h (3.14 x radius squared x height)

Surface area of a rectangular prism

2(lw) + 2(lh) + 2(wh)

Volume of a rectangular prism

lwh
l x w x h

Volume of a cone

1/3 πr2h (3.14 x radius squared x height)