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what is the difference between concave and convex?
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the terms "concave" and "convex" are often used in geometry to describe the shape of a surface or object.

a concave surface or object curves inward, like the inside of a bowl or a spoon. the curve is such that if you draw a straight line between any two points on the surface, the line will lie entirely inside the surface. a concave polygon has at least one interior angle greater than 180 degrees.

a convex surface or object curves outward, like the outside of a ball or a dome. the curve is such that if you draw a straight line between any two points on the surface, the line will lie entirely outside the surface. a convex polygon has all interior angles less than 180 degrees.
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