SOLUTION: What do you call a regular polygon if it’s exterior angle is twice the interior angle? ( show working)

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Question 1101274: What do you call a regular polygon if it’s exterior angle is twice the interior angle? ( show working)
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
number of sides n
360/n is size of exterior angle.
(n-2)/n *180 is size of internal angle
360/n=(n-2)/n*360, multiplying the internal angle by 2
The n in the denominator cancels
360=360n-720
1080=360n
n=3, a triangle, whose internal angles are 60 deg (if regular) and external angles are 120 deg.