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Three vertices polygons (aka triangle) can not be concave or convex because it doesn't have enough verticies to susustain an internal angle is less than or equal to 180 degrees.

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Actually, a triangle IS a convex polygon. Convexity requires angle to be less than 180 degrees and since the three angles of a triangle sum to 180 degrees, each one of them MUST be less than 180 degrees!

Q: Is a triangle convex or concave?

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An equilateral triangle is NOT concave. The sides only push out, and they never cave in. An equilateral triangle is convex. I hope that helped all who needed.

concave

convex

A trapezoid is convex.

A non convex is a concave and a convex is differently shaped

Related questions

Yes, a triangle is always concave. * * * * * How wrong can you get! A triangle is always convex and NEVER concave.

An equilateral triangle is NOT concave. The sides only push out, and they never cave in. An equilateral triangle is convex. I hope that helped all who needed.

concave

The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.

It can be convex or concave.

convex and concave

Lenses: converging (convex) and diverging (concave) Mirrors: concave and convex

concave=in convex=out

convex

A rhombus is an equilateral parallelogram. As such, it is neither concave nor convex.

The Rear view mirrors are convex The Headlights are concave

The opposite of concave is convex. A concave surface curves inward, while a convex surface curves outward.