Answer:
18 will be the number of sides.
Explanation:
As we know that the sum of exterior angles of a polygon is 360°.
The formula is:
- The exterior angle of a polygon = 360 ÷ number of sides
As each exterior angle of a regular polygon is 20°.
so putting the value exterior angle 20° in the formula
The exterior angle of a polygon = 360 ÷ number of sides
20 = 360 ÷ number of sides
20 = 360/number of sides
so the number of sides will be:
number of sides = 360/20
= 18
Therefore, 18 will be the number of sides.