Table of Contents
Is a semi circle a polygon?
A polygon can only be made of straight line segments, by definition. A semicircle doesn’t fit that criterion, so it isn’t a polygon.
Is a semi circle an irregular polygon?
Depending on the shape and curves, a part of the figure can be a circle, semicircle or quadrant as well. The following figure is an irregular shape with 8 sides, including one curve. Decompose the figure into two rectangles and a semicircle.
Is a semi circle a 2 sided polygon?
On a circle, a digon is a tessellation with two antipodal points, and two 180° arc edges. In geometry, a digon is a polygon with two sides (edges) and two vertices. A truncated digon, t{2} is a square, {4}.
Can polygons be circular?
In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. A polygon that does have one is called a cyclic polygon, or sometimes a concyclic polygon because its vertices are concyclic.
Which figure is a polygon?
A polygon is any 2-dimensional shape formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. The name tells you how many sides the shape has. For example, a triangle has three sides, and a quadrilateral has four sides.
Is a pentagon a polygon?
In geometry, a pentagon (from the Greek πέντε pente meaning five and γωνία gonia meaning angle) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°. A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.
Is a pentagon regular or irregular?
In the pentagon, the sum of the interior angles is equal to 540°. If all the sides are equal and all the angles are of equal measure, then it is a regular pentagon. Otherwise, it is irregular. In the regular pentagon, each interior angle measures 108°, and each exterior angle measures 72°.
What is a polygon with 12 sides called?
A dodecagon is a 12-sided polygon. Several special types of dodecagons are illustrated above. In particular, a dodecagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular dodecagon.
Is Pentagon a polygon?
How do you know if something is not a polygon?
Polygons may have any number of sides. A shape with curved sides is not a polygon. A shape that is not fully closed is not a polygon.