Solve the second equation for 
, then substitute it into the first equation.
Answer:
3420°
Step-by-step explanation:
The sum of angle measures of an n-gon is ...
angle total = (n-2)×180°
For n = 21, the angle total is ...
21-gon total = (21 -2)×180° = 3420°
Answer:
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What Do you need help with if you added a picture we cant see it
Answer:
can you get a better picture of this
Step-by-step explanation:
