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After a polygon cuts off an angle, the sum of the inner angles of the formed polygon is 2520 degrees, so what is the number of sides of the original polygon The answer just now is very good. In the paper I bought, another answer is that the original number of sides is 17. I don't know how to calculate it
From the inner angle of polygon and formula: 180 (n-2), we can get the following results:
New polygon side length:
n=2520÷180+2=16
The original polygon has one more edge after cutting off an inner corner,
Now the new polygon is 16 sides, so the original polygon is 15 sides
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