Q: What is Concave on both sides?

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Six Equal Sides :) x

I think it is niether * * * * * A heptagon is simply a plane shape bounded by seven straight sides. Any polygon with three of more sides can be concave or convex.

Dragon is the answer

no it cannot , because a regular polygon is a shape with equal sides, and for it to be concave or convex some sides have to jut out or in See related link below for more information

No. There can be no regular concave polygon.

Related questions

Both sides of a lens curve inward.

contact lenses are concave because their sides curve inward

If this mirror is reflective on both sides, then it can be both concave and convex. Otherwise, the two cannot act like one another.

If this mirror is reflective on both sides, then it can be both concave and convex. Otherwise, the two cannot act like one another.

A nonagon has nine sides: whether it is concave or convex is irrelevant.

Yes. All polygons with 4 or more sides can be concave. An arrowhead is an example of a concave quadrilateral. The back of an envelop (where the sides are folded and glued together) is a concave pentagon.

A nonconvex polygon is a concave polygon. All polygons with 4 or more sides can be concave. An arrowhead is an example of a concave quadrilateral. The back of an envelop (where the sides are folded and glued together) is a concave pentagon.

They are both made of a transparent medium with a refractive index > 1.Both have one or two sides possessing a curvature which, combined with their refractive properties, causes light rays to be deflected(convex ()> ) or (concave )(< )

It is a concave polygon. There are polygons of 4 or more sides that are concave.

No. A trapezoid has two parallel sides. This is not possible in a concave quadrilateral.

it has 8 sides i think

The lens of the eye is biconvex (convex on both sides).