All angles < 180 degrees are concave.
An acute angle is < 90 degrees.
So, all acute angles are concave.
concave
Angle of contact is the angle between a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute . For convex surface , it is obtuse.
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
A simple polygon that is not convex is called concave, non-convex or reentrant. A concave polygon will always have an interior angle with a measure that is greater than 180 degrees.
A concave polygon has at least one interior angle greater than 180 degrees. A convex polygon has none of those.
concave
Angle of contact is the angle between a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute . For convex surface , it is obtuse.
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
A simple polygon that is not convex is called concave, non-convex or reentrant. A concave polygon will always have an interior angle with a measure that is greater than 180 degrees.
concave
Light has little or no effect on a mirror. The mirrors follow the rule: "the angle of incidence equals the angle of reflection". Concave mirrors concentrate light to a point and convex spread it out.
A concave polygon has at least one interior angle greater than 180 degrees. A convex polygon has none of those.
It can be convex or concave.
concave is inward, convex is outward concave is inward, convex is outward
The wing mirror or side mirror of a car is convex. It curves out to be able to see with a wider angle.
convex and concave
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.