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equilateral triangle 3 sides 3 lines of symmetry rotnl symm. order 3

square 4 sides 4 lines of symmetry rotnl symm. order 4

regular pentagon 5 sides 5 lines of symmetry rotnl symm. order 5

hexagon 6 sides 6 lines of symmetry rotnl symm. order 6

heptagon 7 sides 7 lines of symmetry rotnl symm. order 7

octagon 8 sides 8 lines of symmetry rotnl symm. order 8

nonagon 9 sides 9 lines of symmetry rotnl symm. order 9

decagon 10 sides 10 lines of symmetry rotnl symm. order 10

exterior angle = 360 divded by n

interior angle = 180 - exterior angle

sum of exterior angles = 360

sum of interior angles = (n-2) x 180

(n is the number of sides)

rotational symmetry

this is where you can ROTATE the shape or drawing into different positions that all look exactly the same.

the order of rotational symmetry is the posh way of saying: "how…

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