A quadrilateral which has 4 sides
triangle * * * * * A triangle is NOT a 3d shape! A cube.
A triangle has three sides, so a hexagon (a shape with six sides) would have three more sides than a triangle.
An octagon.
hexagon
a square
A polygon with 2 more side than a triangle is a 5 sided pentagon.
A triangle for example has 3 vertices.
One more side.
If (and only if) the length of each pair of sides is greater than the third side, then it is possible to make a triangle.
Any geometric shape that has more than three sides.
triangle