This is a 21 sided polygon and therefore has 21 angles. NOTE : The name supplied for this polygon is an artificial name and never used in practice. General usage refers to this shape as a 21-gon.
Providing that it is a regular polygon then it is a nonagon which has 9 sides
I don't know if there's a specific name for these two shapes, but the only two shapes that have 4 equal sides are the square and rhombus. The difference between the two is the square has 4 equal angles (90 degrees) and a rhombus does not.
It is impossible to have a six sided shape with right angles since the lines would never meet, therefore it would not create a shape. The most right angles you can have in a shape is four. A six sided shape is called a hexagon. There are Regular Hexagons, meaning all the sides and all the angles are equal. Any other Hexagon with unequal sides and angles and called Irregular Hexagons. Each side must be straight, and the sum of the angles equaling 720°.
No, a four sided shape is not always a square. The mathematical name for a four sided shape is a QUADRILATERAL. The definition of a square is a four sided shape with four equal sides and angles, internal angles totalling 360 degrees and four lines of symmetry. If a shape has all of these properties, it is a square.Possibilities for a four sided shape areAs said above, all are called quadrilaterals, but some have special propertiesA Parallelogram, which has opposite sides parallel to each othera Rhombus, which has all sides equal and parallel, but not necessarily with right anglesA Rectangle, which is a parallelogram with right angles.A Square, which is a rhombus rectangle. All four sides equal, all angles equal and right, all diagonals bisecting each other. It really is hip to be square.
There is no specific name for a polygon in which all the angles are different or where the sides are all different.
That would be called a regular polygon, one with congruent(equal) side legnths and congruent angles.
If those are the only sides and angles it has, then it's a regular pentagon.
There is no special name for that. However, if the sides are also equal, it is called a regular polygon.
A rhombus
The name of a regular polygon with five equal sides and five equal angles is a pentagon. Each of the internal angles is equal to 108 degrees.
it is called a square
pentagon
A polygon that has congruent sides and congruent angles is called a Regular polygon. If the number of sides is given, you can be more specific. Some examples: 3 congruent sides/angles = equilateral triangle 4 congruent sides/angles = square 5 congruent sides/angles = regular pentagon 6 congruent sides/angles = regular hexagon ...and so on, by adding "regular" in front of the shape's name.
If a polygon's sides are all of equal length, it is known as a regular polygon. (The measure of each of its angles will be the same as well)
Such a polygon is said to be a "regular" polygon, meaning that all its sides are equal and all its angles are equal, so we have; equilateral triangle; square; pentagon; hexagon; heptagon;octagon;nonagon;decagon - to give but the first nine possibilities. The next one would have 11 equal sides and angles, and I don't know its name.
The name of a regular polygon, with ten equal sides and ten equal angles, is a decagon, from the Greek word "deka", meaning ten.