#### AREA FORMULAS

CIRCLE:

πr2    (π =constant=3.142(approx), and r = radius)

RECTANGLE:

ab   (a = width and b = height of rectangle)

SQUARE:

a2       (a = width  = height of square, all sides equal)

TRIANGLE:

1/2(bh)    (b = base width  and h = height of triangle)

#### SURFACE AREA

CYLINDER:

2π(r2 + rh)  ( π=constant=3.142(approx), r = radius, h = height)

CUBE:
6a2
(a=length of each side of the cube)

SPHERE:
4πr2     (π =constant=3.142(approx), and r = radius)

CONE:
1/3πr2h    (π=constant=3.142(approx), r = radius, h = height)

RECTANGULAR PRISM:
2ab + 2ah +2bh
(a = length, b = width, h= height)

CYLINDER:
πr2h
(π=constant=3.142(approx), r = radius, h = height)

PYRAMID:
1/3(bh)
(b = base width  and h = height of pyramid)

#### VOLUME FORMULAS

SPHERE:
4πr2h

CONE:
1/3πr2h    (π=constant=3.142(approx), r = radius, h = height)

CUBE:
a
3   (a = length = width  = height of cube, all sides equal)

CYLINDER:
πr2h    (π=constant=3.142(approx), r = radius, h = height)

PYRAMID:
1/3(bh)
(b = base width  and h = height of pyramid)

RECTANGULAR PRISM:
abc
(a = length, b = width and c = height of rectangular prism )

#### PERIMETER:

CIRCLE:
πd or 2πr
(π=constant=3.142(approx), d = diameter and r = radius)

SQUARE:
4a or  a + a + a +a
(a = length of each side of square)

RECTANGLE:
2(a + b) or  a + b + a + b
(a = length, b = height of rectangle)