Star
semicircles
what shape beginning with i does not have equal sides
An Octagon?
As the "octa" at the beginning of the word would imply, an octagon is a shape with eight sides.
Star
square
semicircles
square, septagon (heptagon)!
decahedron
what shape beginning with i does not have equal sides
a ball
Terraria
Quadrilateral
The only shape that is not technically a shape is a wheel. A wheel is basically a circle, however everything is a shape, isn't it?
alases
prism