Question

A regular polygon has possible angles of rotational symmetry of 20°, 40° and 80° How many sides does the polygon have?

Answer 1

Answer:

y=7

Step-by-step explanation:

3y+7*(y-4)/7*3=2

3y+7y-28/21=2

3y+7y-28=21*2

3y+7y-28=42

3y+7y=42+28

10y=70

y=70/10

=7

means y=7