Central angle of a regular polygon: Ф = 360° : n. If n=12: Ф = 360° : 12 = 30° At the angle of rotation Ф = 30° the image of the polygon will coincide with the preimage.
.8 is 80% this is because .8 can be written as a fraction 80/100 this is 80% another way we could have found this is by multiplying .8 times 100 because that is our denominator.
