Acute angle
The corner on a shape where edges meet is called a vertex.
a right angle or a 90 degree angle, the sides are perpendicular to each other
true
diagonal
A diagonal
square
A square cannot be a corner and a corner cannot be a square.
another name for an open square is a plaza
As you can see, this square is made up of two triangles. The line drawn down the middle, from corner to corner, is the line you are asking about, that creates the "two things" or the two triangles on either side of it.
Right angle.
another name for box is cube or square.
Diagonal is a straight line through a figure from one corner to another corner, for example, the diagonal divided the square into two triangles.