yes if it was dome shaped
It could have four if it is 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.
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.
plano concave
Concave, because you can connect the corners from the outside.
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
no concave mirror is in shape of concave mirror
concave=in convex=out
concave lenses are prescribed by doctors
concave
His glasses have a concave lens.