Step-by-step explanation:
The reason why all the addition of the all the triangle's angles is equal to 180° is because it's a rule
REMEMBER THAT RULE !!!!
If you have any questions about the way I solved it, don't hesitate to ask me in the comments below =)
<span>If you are given a convex polygon with </span>
<span> sides and </span>
<span> is the sum of the measures of the interior angles then </span>
<span>.
So, </span>
.
The polygon has
11 sides.