Question

The number of triangles formed by drawing diagonals from one vertex of a polygon is 18. Then a) what is the sum of angles of the polygon? b) what is the number of sides of the polygon?

what is the answer​

Answer 1

Step-by-step explanation:

Exept two sides those meet at the vertex where all the diagonal meet 18 sides of the polygon will be the base of 18 triangles. Thus, totan number of sides= 18+2=20

The sum of internal angles = 20 π – 2 π = 18 π