3 sided

triangle

4

quadrilateral

5

pentagon

6

hexagon

7

heptagon

8

octogon

9

nonagon

10

decagon

11

hendecagon

12

dodecagon

slope formula

m=(y2-y1)/(x2-x1)

midpoint formula

m= (x1+x2)/2, (y1+y2)/2

distance formula

square root ((x2-x1)² + (y2-y1)²

sum of all interior angles

sum of angles = (n-2)x180 where n = # of sides

to find # of sides

single angle= ((n-2) x 180)/n

sum of exterior angles

360