i dont think any1 knows
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A concave polygon has at least one reflex angle.
Equivalently, in a convex polygon, a line joining ANY two points in (or on) the polygon lie wholly within (or on) the polygon. In a concave polygon there are at least two points for which the line joining them does not lie wholly inside (or on) the polygon.
A convex shape is a shape that is pushing out like a house -> /\ <- |_|
No a parallelogram cant be concave because the only parrallelograms there are arent concaveParallelograms...*rectangle *square* rhombus*rhomboidMeaning of concave-polygons that have parts that go into the shape.
A dodecahedron is a generic term which describes a 3-dimensional shape with 12 polygonal faces. There are approx 6.4 million topologically different convex dodecahedra plus concave ones. They can have 8 to 20 vertices and 18 to 30 edges.
Food shaped like a polygon
This would be a type of concave or reentrant polygon, but might also have a specific name, perhaps a concave heptagon, or a reentrant heptagon.
convex
Aside from the shape of the free edge, what is the difference between the oval-shape nail and the round-shape nail?
A geometric star shape is concave. A star that is in the sky is convex.
A converging lens is also known as a magnifying lens. The shape of the lens is a double convex shape.
An arrow can have both concave and convex surfaces, depending in its design.
Convex. The hearts inward point makes this so.
A convex lens is thicker in the center than at the edges. A convex lens is like a concave mirror.A concave lens is thinner in the center than at the edges.
Concave is thinner in the center than the edges and convex lens is thicker in the center than on the edges :)
concave
A spoon that you have put some food into is a concave shape. It is a cavity. A concave lens is such that it is thicker at the edges than in the middle. Convex is the bottom of the spoon. A convex lens is thicker in the centre than around the edges.
A normal 2-D quadrilateral would be neither convex or concave. There are three-dimensional quadrilaterals, such as prisms, but it would depend on the shape.
Compound microscopes usually have two types of lenses, the concave and convex. The concave is more of an hourglass shape, while the convex is more of a rounder shape.