1
3 sided
triangle
2
4
quadrilateral
3
5
pentagon
4
6
hexagon
5
7
heptagon
6
8
octogon
7
9
nonagon
8
10
decagon
9
11
hendecagon
10
12
dodecagon
11
slope formula
m=(y2-y1)/(x2-x1)
12
midpoint formula
m= (x1+x2)/2, (y1+y2)/2
13
distance formula
square root ((x2-x1)2 + (y2-y1)2
14
sum of all interior angles
sum of angles = (n-2)x180 where n = # of sides
15
to find # of sides
single angle= ((n-2) x 180)/n
16
sum of exterior angles
360