Geometry Cheat Sheet
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1Angles
Obluse angle geator fr|an 9(P
Complementaryangles
SuppbmenAryargles
tu,o arybs add up to 90"
trrc anglos edd Lp b 18ff
t--
Right angle equab 90"
V
/_
Acute arqle b6sr|en 9(P
G
Complete angle
rotation equals 3flf
=
Palallel Lines
*
Ellipse
Lines
<->
Lirp
H
Line Segment
H
Ray
- F - - - ) -
----
Lhe of Symmetry
Cirelee
Cide
Heron'e
x
Rectangb
re
Square
*
Regular Octagon
#
re
Paralblogram
t
kgularHo€gort
perimete(s)
Pythagorean Theorem
A
"
l ' ' l
s 2 _ s 2 a n 2
a
All kimebrs
P = ? + b + c + . . .
S$raG
PerinreEr P=1s
Ata A= *
Rectanglc
Pqimder P=21 +2w
Atea A= hw
Chcb
Circmferute
C=hl
Areg A=*f2
Trhngts
Periltder P= a+ b+ c
Arcn A=!
ttt
PardHogmanr
PedmeW P= ?t b+ c+ d
Ata
A= tth
s ClrctkSec"lor
Arre A=+14
ffi
A
"ti'ff \
b
ffi
@
@1
@l
_-i{L___
CDIL
Cfrcnk Rkrg
A r c a A = r ( # - f )
fnpeacfC
Periltder P= a+ b+ c+ d
A r e € A =
( a + b ) h
2
Spttee
Sutt#
S=4nf
volunv v=d
3
krguhr
Bor
Sutfffi g=2(hl+ tw+ M
Vdunp V- Ml
RStt €XrcuFClilndel
gJttffi
S=h,rh
Vd,rrle v=nfh
n$*CirrurFConp_
&rt#
S=s,lf
+ tl
VotmE v= trln
Frusfrrm of a Cone
Volunp V= t"flf
* n+ *'l
GeorneFy
Sources:
Geometry
Glossary
http //ibrary.fi in
lossary. htm
New York Public Libnry Desk Reference,
Third Edition. Macmillan
Wright, John W. ed. The New York 77mes Almanac Millennium
Edition.
Penguin Reference
Dave's Math Tables: Areas, Volumes, Surface Areas
htm
Measurement
Formulas
http//library.thinkq
htm
Ask Dr. Math Regular Pofgon Formulas
Ask Dr. Math Circle Formulas
http /Arwrv.askd
rmath.coln/d
r. mattlfaq/form
u la#fao.circle.
html
Ask Dr. Math Triangle Formuhs
htto/lunrw.askdrmath.conUd
r. mathlfaqfformulaMaq.triangle.
htm I
Ask Dr. Math 0uadrilateral
Formulas
htto://
html
Common Formulas
)1
726. html
Swokowski, Ofnik and Pence. Calculus of a Single Variable, 2nd EditionP.W.S.
*
Radius
Geometrie Formulee
Straight angle equats 180"
:
ryh^
-
- -
RegFJar Fentagon
*Ro14*
A
Equihteral
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