Find the number of sides of a regular polygon with an interior angle measuring 120 degrees

Using the attached formula:

Number of sides = 360 / (180 - one interior angle)

Number of sides = 360 / 60

Number of sides = 6

Step-by-step explanation:

the answer is mc^1-1jpeg

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: