Q: Why is not the shape convex?

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A convex shape.

Most all corrective lenses are convex. Anything round, or even just "roundish" has a convex shape. From bowling balls to chickens' eggs, they are all convex, or "rounded outward" in shape.

it is a shape with 180degrees or less

Take any two points on or inside a body. If every point on the straight line joining the two points lies within the shape, then it is convex. If not, it is non-convex.

I believe the fewest number of sides in a planar, non-convex polygon is four.

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A convex shape is a shape that is pushing out like a house -> /\ <- |_|

convex

A parallelogram need not be a square, it need not be a rhombus but it is a convex shape.

No. Convex simply means that if you have a straight line segment joining any two points in (or on) a convex shape, then every point on that line segment in inside or on the shape. A convex shape can have 2 or more dimensions, it can by a polygon or have curved sides.

convex

A convex shape.

A parallelogram cannot be generalised to a convex shape with an odd number of sides.

Most all corrective lenses are convex. Anything round, or even just "roundish" has a convex shape. From bowling balls to chickens' eggs, they are all convex, or "rounded outward" in shape.

Convex. The hearts inward point makes this so.

Convex is usually bigger than concave. In a convex shape, an imaginary line connecting any two points lies completely within the shape, making it appear more expansive. In contrast, a concave shape curves inward, often providing less surface area than a convex shape of similar dimensions.

A converging lens is also known as a magnifying lens. The shape of the lens is a double convex shape.

convex