A c u t e A n g l e
A n A n g l e t h a t i s l e s s t h a n
9 0 d e g r e e s .

A c u t e Triangle
A t r i a n g l e t h a t i t ' s b i g g e s t a n g l e
i s l e s s t h a n 9 0 d e g r e e s .

A n g l e
The a m o u n t o f r o t a t i o n .

A r e a
T h e n u m b e r o f s q u a r e u n i t s i n
a f l a t f i g u r e .

E q u i l a t e r a l T r i a n g l e
A t r i a n g l e t h a t h a s t h r e e c o n g r u e n t
s i d e s .

H e p t a g o n
A s e v e n s i d e d p o l y g o n .

H e x a g o n
A s i x s i d e d p o l y g o n .

I s o s c e l e s T r i a n g l e
A t r i a n g l e w i t h t w o c o n g r u e n t
s i d e s .

M e t r i c S y s t e m
T h e i n t e r n a t i o n a l s y s t e m o f
m e a s u r e m e n t w h i c h i n c l u d e s
c e n t i m e t e r s , a n d k i l o m e t e r s . e t c .

O b t u s e A n g l e
A n A n g l e w h i c h i s m o r e t h a n 9 0
d e g r e e s .

O b t u s e T r i a n g l e
A t r i a n g l e w h o s e l a r g e s t
a n g l e i s m o r e t h a n 9 0 d e g r e e s .

O c t a g o n
A e i g h t s i d e d p o l y g o n .

P a r a l l e l o g r a m
A q u a d r i l a t e r a l w h i c h h a s o p p o s i t e
s i d e s t h a t c o n g r u e n t .

P e n t a g o n
A f i v e s i d e d p o l y g o n .

P i
A r a t i o o f t h e c i r c u m f e r e n c e
o f a c i r c l e d i v i d e d b y t h e
d i a m e t e r .

P o l y g o n
A t h r e e o r m o r e c l o s e d , f l a t
f i g u r e w h i c h i s m a d e o f o n l y
s t r a i g h t l i n e s .

P r o t r a c t o r
A t o o l u s e d t o m e a s u r e a n g l e s .

R a d i u s
T h e l e n g t h b e t w e e n t h e c e n t e r o f
a c i r c l e t o t h e o u t s i d e o f t h e c i r c l e .
T h e r a d i u s i s t w o t i m e s t h e l e n g t h
t h e d i a m e t e r .

R e c t a n g l e
A f o u r s i d e d p a r a l l e l o g r a m w i t h
4 r i g h t a n g l e s .

S c a l e n e T r i a n g l e
A t r i a n g l e t h a t d o e s n ' t h a v e
a n y c o n g r u e n t s i d e s .

S e m i c i r c l e
H a l f a c i r c l e .

S q u a r e
A f o u r s i d e d p a r a l l e l o g r a m
t h a t h a s c o n g r u e n t s i d e s .

T r i a n g l e
A t h r e e s i d e d p o l y g o n .
A l l s t r a i g h t s i d e s .





OTHER MATH TERMS
Average
To find the average of numbers
You add up the numbers and
Divide the sum by the amount
Of numbers you added up.

Bar Graph
A graph that shows the data
with the length of the bars.

Common Denominator
A common multiple of two different
denominators.

Decimals
Decimals show parts of a whole
Number, for example .5 which is
1/2 of 1.

Denominator
Denominators are the bottom part
of a fraction. They say how many parts
there are to a whole.

Division
Division can be used to break up
A number into many different
Pieces.

Equation
A sentence with numbers that can
Be used to figure out a problem.

Fraction
Numbers that are used to show parts
of the whole, the numbers look like this
3/5 which means 3 parts of a whole.

Least Common Denominator
The lower number that is a denominator
For both or all the numbers.

Numerator
The top part of a fraction which shows
Part of the whole.

Percent
A percent is a part of 100, much like
a fraction. For example 25/100 is 25%.
The sign % means percent.

Simplest Form
The smallest form of a fraction, for
Example 12/48 can be simplified to
1/4. This is done dividing the denominator
and numerator by the largest number you
can get to go into both numbers.