Describe the error in finding the measure of each interior angle of a regular 20-gon.

Possible answers:

1. The multiplication was incorrect. The product of 18 and 180 is not 3240.
2. The division was incorrect. The quotient of 3240 and 18 is not 180.
3. The sum of the interior angle measures should have been divided by the number of angles 20.
4. The right side of the formula is n⋅180°, not (n−2)⋅180°.

Then, correct the error. The measure of each interior angle is:

Error is in the photo below.