yes if it was dome shaped
Not by itself.
concave
It could have four if it is concave.
concave concave
windows if u have a old camera or binoculars,u could open them up and get the concave and convex lenses from there.
An octagon is an eight-sided two-dimensional object. If each of the eight sides to an octagon were concave, it would still be an octagon. So, yes, it could.
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
plano concave
no concave mirror is in shape of concave mirror
Concave, because you can connect the corners from the outside.
concave=in convex=out
Concave