Trapezoid
A pentagon is a 5 sided polygon
An octagon is an eight-sided figure.
yes
impossible?
In geometry, a heptagon is a polygon with seven sides and seven angles.
trapezoid :)
parrellogram
A 5 sided polygon in geometry is a pentagon.
1
If the lines are straight then it IS a triangle.
Anything from none to 8.
A decagon has 35 diagonals