Every triangle has.
No such shape exists.
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
A shape that it is 3D and has sides, corners and faces
That's impossible, because if a shape has sides, then it means it has corners, and vice versa.
This shape has ten sides
No such shape exists.
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
cannot be a polygon.
A shape that it is 3D and has sides, corners and faces
The basic shape with 3 sides and 3 corners is called a triangle. A triangle is a polygon with three straight sides and three angles. It is the simplest polygon in Euclidean geometry.
An heptagon has 7 corners and 7 sides whereas an octagon has 8 corners and 8 sides
No shape can have two corners
A shape that has square corners but not three sides is a rectangle. Rectangles have four sides and feature right angles, which are the square corners you're referring to. Other examples include squares, which are a specific type of rectangle, and other quadrilaterals that may also have square corners.
That's impossible, because if a shape has sides, then it means it has corners, and vice versa.
A triangle is a shape that has 3 sides and 3 corners. It is a three-sided polygon, which is a plane shape bounded by three straight lines.
This shape has ten sides
A penagon is a shape with five sides and five corners.