Each exterior angle of a regular n-gon has a measure of 9º. How many sides does the polygon have?

40

Step-by-step explanation:

All exterior angles of any regular n sided polygon add up to 360 degrees.

360/9=40

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

c. 6tan80

step-by-step explanation: