How to do the math answer on page 3 1 of the fourth grade summer homework?
The sum of external angles is 360.
Example:
Hexagon. The external angle and 360, an external angle is 60, and an internal angle can be calculated as 360-60 = 300. Therefore, the sum of internal angles is 300*6= 1800. The rest, I believe with your IQ, should be no problem.