The polygon has an interior angle sum of 900° is polygon D
Sum of an interior angle of a polygon
The equation for the sum of interior angle is given as (n-2)180
Substitute
900 = (n - 2)180
Expand the parenthesis
900 = 180n - 360
180n = 900 + 360
180n = 1260
n = 1260/180
n = 7
This shows that the required polygon must have 7 sides. Hence the polygon has an interior angle sum of 900° is polygon D
Learn more on sum of interior angles here: https://brainly.com/question/24966296
