Parallelogram

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Square or

Rectangle

Area =

Length X

Width = lw

Perimeter =

2 Lengths +

2 Widths =

2L+2W

Parallelogram

Area = Base

X Height =

bh

Triangle

Area = ½ of

base X

height =

1/2bh

Perimeter =

a+b+c (add

length of 3

sides)

Apezoid

Area =

(

𝑏1+𝑏2

2 ) ℎ

Perimeter =

area + b1 +

b2+ c

Circle

Circumfere

nce =

distance

around the

circle = c

Diameter =

distance

across the

circle = d

Radius =

distance

from center

to point on

a circle = r

𝐴 = 𝜋𝑟2

𝜋 = 3.14

D= 2r C=

𝜋𝑑 =

2 𝜋𝑟 =

𝜋𝑟 2