10. There are none in a temptation.
That triangle needs 7 more sides and angles to be a decagon!
The sum of angles in a decagon [10 sided polygon] is 1440°. There cannot be 8 or more reflex angles, since 8 x 180° = 1440°. So see if 7 will work. You could have 7 angles at 181°, then 3 angles, which add up to 173° {say 58°, 58° & 57°}, and it would be a valid decagon.
Heptagon, octagon, nonagon, decagon, hendecagon, and dodecagon. There are many more.
The sum of the exterior angles of any polygon is always 360 degrees.
A decagon can have eight or more triangles - up to infinitely many.
A decagon has 7 more sides than a triangle. A triangle has 3 and a decagon has 10.
decagon has 10sides octagon has 8sides decagon have 2sides more than octagon
decagon has 10sides pentagon has 5sides 10-5=5 decagon has 5 sides morethan pentagon
The answer depends on what you are trying to measure: interior angles, exterior angles, central angles, lengths of sides, apothems, perimeter, lengths of diagonals, area, etc. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
A decagon has 10 sides, and a quadrilateral has 4 sides, therefore a decagon has 6 more sides than a quadrilateral.
An octagon has -2 [negative 2] more sides than a decagon.
A decagon has 10 sides A heptagon has 7 sides Therefore a decagon has 10 - 7 = 3 more sides than a heptagon.