# What is the convex and concave?

Asked By: Marli Revilla | Last Updated: 2nd March, 2020
Category: science space and astronomy
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Convex and concave are two words that describe a line or shape, often in mathematics, science, or in relation to eyeglasses and mirrors. While convex means to bend or protrude outwards, concave is the opposite and means to bend inwards.

Regarding this, what is concave and convex surface?

Concave is an adjective that describes a surface that curves inward, or is thinner in the middle than on the edges. In ordinary usage, concave and convex are typically used when referring to glass surfaces, like the lenses of optical viewing equipment. The side mirror of a car has a concave surface.

Additionally, what is a convex shape? A convex polygon is defined as a polygon with all its interior angles less than 180°. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. Note that a triangle (3-gon) is always convex. A convex polygon is the opposite of a concave polygon.

Also Know, what is concave convex rule?

The “concave on convexrule Instead of moving the ball, move and roll your palm around the stationary ball. As your palm rolls around the ball, it also glides in the same direction. So, when a concave joint surface is moving on a convex joint surface, roll and glide occur in the SAME direction.

What shape is concave?

Curved inwards. Example: A polygon (which has straight sides) is concave when there are "dents" or indentations in it (where the internal angle is greater than 180°)

### What is a concave relationship?

A function of a single variable is concave if every line segment joining two points on its graph does not lie above the graph at any point. Symmetrically, a function of a single variable is convex if every line segment joining two points on its graph does not lie below the graph at any point.

### What is a concave curve?

concave. Concave describes an inward curve; its opposite, convex, describes a curve that bulges outward. They are used to describe gentle, subtle curves, like the kinds found in mirrors or lenses. If you want to describe a bowl, you might say there is a large blue spot on the center of the concave side.

### Is a circle convex?

The interiors of circles and of all regular polygons are convex, but a circle itself is not because every segment joining two points on the circle contains points that are not on the circle. . To prove that a set is convex, one must show that no such triple exists.

### What is concave down?

A graph is said to be concave up at a point if the tangent line to the graph at that point lies below the graph in the vicinity of the point and concave down at a point if the tangent line lies above the graph in the vicinity of the point.

### What is a convex 2d shape?

Convex Shapes and Polygons
To be convex is to be curved outwards. A polygon is a two-dimensional shape with straight lines as sides. A polygon is convex if all of its internal angles are less than or equal to 180 degrees.

### Is Water concave or convex?

A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.

### What is convex in science?

adjective. curving or bulging outwards. physics having one or two surfaces curved or ground in the shape of a section of the exterior of a sphere, paraboloid, ellipsoid, etca convex lens. maths (of a polygon) containing no interior angle greater than 180°

### What is convex versus concave?

A convex shape is the opposite of a concave shape. It curves outward, and its middle is thicker than its edges. Just like concave, convex can be used as a noun for a surface or line that curves outward, and it also has a use in geometry, where it describes a polygon with interior angles less than or equal to 180°.

### What does Osteokinematics mean?

osteokinematics. (ŏs″tē-ō-kĭn″ĕ-măt′ĭks) The branch of biomechanics concerned with the description of bone movement when a bone swings through a range of motion around the axis in a joint, such as with flexion, extension, abduction, adduction, or rotation.

### What is the difference between a convex and concave?

The basic difference between concave and convex are as follows: Concave describes a shape that curves inwards. The sideview mirror of a car, which curves inwards, is a good example of a concave shape. Convex describes a shape that curves outwards.

### What is convex and concave polygons?

Lesson Summary. Polygons can be classified as convex or concave. In a convex polygon, every diagonal of the figure passes only through interior points of the polygon. In a concave polygon, at least one diagonal of the figure contains points that are exterior to the polygon.

### Is Talus concave or convex?

Structure. The talus is oriented slightly obliquely on the anterior surface of the calcaneus. There are two points of articulation between the two bones: one anteriorly and one posteriorly: At the anterior talocalcaneal articulation, a convex area of the talus fits on a concave surface of the calcaneus.

### Is the shoulder joint concave or convex?

If the moving joint surface is CONVEX, sliding is in the OPPOSITE direction of the angular movement of the bone. If the moving joint surface is CONCAVE, sliding is in the SAME direction as the angular movement of the bone. Glenohumeral articulation: concave glenoid fossa articulates with the convex humeral head.

### Is the elbow joint concave or convex?

On the lateral side, the concave end of the head of the radius meets the rounded, convex capitulum to complete the elbow joint. The annular ligament of the elbow extends from the ulna around the head of the radius to hold the bones of the lower arm together.

### Which joint partner is concave and convex?

A saddle joint is a biaxial joint in which each bony partner has a concave and convex surface oriented perpendicular to each other, like a rider in a saddle.

### What is an accessory motion?

Accessory Movement - Accessory or joint play movements are joint movements which cannot be performed by the individual. These movements include roll, spin and slide which accompany physiological movements of a joint. Overpressure - Each joint has a passive range of movement which exceeds its available active range.

### How many sides does a convex hexagon have?

Polygons
Polygon Name Number of Sides Number of Diagonals
Triangle 3 0