It's a polygon with 14 points (If the two ends meet) or 16 points (If the two ends don't meet).
A 15-sided figure is called a pentadecagon.
90
15
15
Pentadecagon, although most mathematicians would use "15-gon."
heptagon * * * * * No. That is a 7 sided figure. A 17 sided figure is a heptadecagon.
Assuming the question is about a 15 sided figure rather than a 15 shaped figure, it is most commonly known as a pentadecagon, less so as a quindecagon, and even less familiarly as pentakaidecagon.
A ten sided figure is a decahedron.
An eight sided figure is an octagon.
1/2*(152-45) = 90 diagonals
In 2 dimensions, a regular 5 sided figure is a pentagon. In 3 dimensions, there is no regular sided 5 sided figure. The tetrahedron is a regular 4 sided figure and a cube is a regular 6 sided figure.
the answer is 2340 deg. in general for an "n" sided figure, the internal angle is (n-2)*180