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No, a convex polygon cannot have an interior angle sum of 400 degrees. The sum of the interior angles of a convex polygon is always equal to (n-2) * 180 degrees, where n is the number of sides. Since the sum of the interior angles must be greater than 180 degrees for each interior angle, a convex polygon with an interior angle sum of 400 degrees would require at least 9 sides, which would make it a nonagon, not a polygon.
Numbers can be rounded to 400 if they fall within the range of 350 to 449. This range includes all numbers from 350.5 to 449.49, as they would round up to 400. Therefore, there are 100 numbers that can be rounded to 400.
400
120 degrees
As a triangle - no. Only a straight line.