It derives ultimately from the Latin for "four". The chain goes something like
Latin quattour "four"
Latin quadrus "square"
Latin exquadrare "to make square"
Old French esquire "a square, squareness"
English square
square= 'four equal'
Square
Square.
Square
the vertices are the corners to the shape, so you count the corners to whatever shape.
square circle
square got its name from being a special square and being equal
the name of a shape with four faces is a square or rectangle.
Square
Square.
a square
A shape with a square base and four triangular sides is a pyramid.
There is no specific name because there is no specific shape. The shape could have anything from 5 to 13 sides depending on the sizes and orientations of the triangle and square.
Square
Square
square
square
square circle