Geometry Formulas

Key

c = circumference

d = diameter

pi = 3.14

r = radius

b = base

h = height

a = area

/ = divide by

x = multiply

Formulas

d x pi = c

2r = d

2r x pi = c

d/2 = r

c/pi/2 = r

c/pi = d

a = pi x r x r.

bh = a

Area of a triangle: bh/2