Question

what is the
the sum of all the angles of a
Il side polygon​

Answer 1

We know that:-

sum of all the interior angles of the polygon = (no. of sides - 2) × 180

so,sum of all the angles of a  11 side polygon​ = (no. of sides - 2) × 180

                                                                          = (11-2) × 180

                                                                          = 9×180

                                                                          = 1620

Hope it helps  :)