Two shapes are similar when the sides of one are directly proportional to the corresponding sides of the other. That all the corresponding angles are equal.
There are infinitely many 2d shapes. They can have 1 side (a circle or ellipse) to infinitely many. They can have sides that are straight or not, the sides can be equal or unequal in length, the angles can be equal or unequal, etc.
A Square
You specify shapes by the number of sides (or edges, different name) they have. The suffix -gon at the end of a word show how many sides it has in the words. For example, an octagon has eight sides; so if you see a shape with eight sides, it's an octogon. All shapes are known as polygons, which means it has three or more sides.
An infinite number. A polygon with any number of sides can be equilateral (ie have sides of equal length).
Two shapes are similar when the sides of one are directly proportional to the corresponding sides of the other. That all the corresponding angles are equal.
All shapes have sides. Including a circle which has one curved side.
There are infinitely many 2d shapes. They can have 1 side (a circle or ellipse) to infinitely many. They can have sides that are straight or not, the sides can be equal or unequal in length, the angles can be equal or unequal, etc.
Many shapes circle, equalateral triangle, square, and all normal shapes from then on such as pentagon and hexagon etc.
A Square
all triangles fit this description, as would many irregular (not all sides are of equal length) versions of shapes with more sides
All regular shapes have congruent sides.
Yeah.
A shape can have one side, as in a circle or an ellipse; and there are no limits to the maximum number of sides a polygon can have.
You specify shapes by the number of sides (or edges, different name) they have. The suffix -gon at the end of a word show how many sides it has in the words. For example, an octagon has eight sides; so if you see a shape with eight sides, it's an octogon. All shapes are known as polygons, which means it has three or more sides.
An infinite number. A polygon with any number of sides can be equilateral (ie have sides of equal length).
Regular shapes are shapes where all the sides and angles are equal. One example of a regular shape is a square because all the sides are the same and all the angles are 90 degrees.