It is the regular 7 sided heptagon whose interior angles are greater than the regular 3 sided triangle
If, by longer, you mean larger, the answer is a heptagon.
It is the regular triangle whose exterior angles are greater than the regular heptagon
True * * * * * No. The only regular polygons that will tessellate are a triangle, a square and a heagon. So a regular heptagon will not tessellate.
Either could have a larger interior angle. If they were regular, then the interior angle of a triangle would be 60 degrees whereas that of a heptagon would be 128.57 degrees. The REGULAR heptagon would have a larger interior angle than a REGULAR triangle.
If they are both regular then the 7 sided heptagon has a larger interior angle than a 3 sided equilateral triangle.
It is the regular equilateral triangle whose each exterior angle is 120 degrees
It is the equilateral triangle that has the largest exterior angle of 120 degrees
There is no such regular polygon with 45 degree interior angles; the smallest interior angles in regular polygons are 60 degrees, which is found in a triangle.