Apolygon is such that when all diagonals from one vertex are drawn, eleven triangles are formed. how many sides does the polygon have?

9
11
12
13

Option D, 13

Step-by-step explanation:

A polygon is such that when all diagonals from on vertex are drawn, eleven triangles are formed.

We have to tell number of sides of the polygon.

Since number of triangle"y" formed by "n" number of vertices can be represented by (n-2) = y

By putting y = 11 in the equation

11 = (n-2)

n = 13

Option D is the answer.

6/20

step-by-step explanation:

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.