## What is an entrant polygon?

Definitions of reentrant polygon. a polygon with one or more reentrant angles. synonyms: reentering polygon.

**What is the proper definition of angle?**

In geometry, an angle can be defined as the figure formed by two rays meeting at a common end point. An angle is represented by the symbol ∠. Angles are measured in degrees, using a protractor.

### What does angle to the ground mean?

: the angle that an airplane’s wing chord makes with the horizontal when the airplane is standing at rest.

**Can a polygon be concave?**

A concave polygon is a polygon that is not convex. An example of a non-simple (self-intersecting) polygon is a star polygon. A concave polygon must have at least four sides.

## What are the 7 types of angles?

The rays making an angle are called the arms of an angle and the common endpoint is called the vertex of an angle. There are \(7\) types of angles. These are zero angles, acute angles, right angles, obtuse angles, straight angles, reflex angles, and complete angles.

**What is angle of ground called?**

Elevation Angle: angle of beam with respect to the ground. . Elevation Angle angle of beam with respect to the ground. The second is the angle of the beam with respect to the ground; called the “elevation angle”.

### What is difference between concave and convex polygon?

What is the Difference Between a Concave and Convex Polygon? A convex polygon does not have a dent in the shape whereas a concave polygon has one side of the shape towards the inside of the shape. The interior angles of a convex polygon are less than 180° whereas the angles in a concave polygon are more than 180°.

**Is pentagon concave or convex?**

Thus, for example, a regular pentagon is convex (left figure), while an indented pentagon is not (right figure). A planar polygon that is not convex is said to be a concave polygon.

## Is a star convex or concave?

A star is a concave polygon.

**What is reentrant angle and salient angle?**

reentrant angle- an interior angle of a polygon that is greater than 180 degrees reentering angle interior angle, internal angle- the angle inside two adjacent sides of a polygon salient angle- an angle pointing outward; an interior angle of a polygon that is less than 180 degrees

### What is the meaning of reentering angle?

Definition of reentering angle. : an angle pointing inward; specifically : an angle in a line of troops or of fortifications with its apex turned away from the enemy —opposed to salient angle.

**What is the re-entrant angle of a sprue puller?**

For example, if one sprue puller is machined at a re-entrant angleof 5[degrees] per side over 0.171 in., and another is machined at just 1[degrees] per side over 0.859 in., they both will have the same 0.015 in. Know the Basics of Sprue-Puller Design: PART 1