A polygon has an interior angel sum of 1800 degrees. how many sides must the polygon have

Step-by-step explanation:

The sum of interior angles of a polygon is given by

where

n is the number of sides

From the question the sum is 1800°

Substitute the value into the above formula and solve for the number of sides

That's

( n - 2) × 180 = 1800

180n - 360 = 1800

180n = 1800 + 360

180n = 2160

Divide both sides by 180

n = 12

Therefore the polygon has 12 sides

Hope this helps you

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.