Answer: The error is the number of sides, it should be 9 sides and not 25. Correct is 1 260 degrees
Explanation:
The error is the number of sides, it should be 9 sides and not 25.
Polygon sum of interior angles formula: 180 x (n-2)
So here n = 9 (sides)
180 x (9-2)
180 x 7 = 1 260 degrees