Can someone please help me I really need help please help me thank you

Answer:
1800 or D.
Step-by-step explanation:
Ill post a link an article that can help you master this, I found it very useful. Tell me if you need help after reading it
Answer: D 1800 degrees
Step-by-step explanation:
The sum of the interior angles can calculated by using the formula 180(n-2) where n is the number of sides of the shape. Plug 12 in for n and you'll get 1800 degrees which is the sum of all the interior angles in the polygon. Hope this helps :D