A shape's sides are called faces.
A shape that has 11 sides is called a hendecagon.
icosikaienneagon
A nonagon
An octagon
A nine sided shape is called a nonagon.
18
a line
Interior angle
I guess 13 angle shape
A seven sided shape is called a heptagon or a septagon.......
24.216 in word form is: twentyfour point two one six.Or twentyfour and two hundred and sixteen thousandths.