The line that divides a square into two equal parts is called the diagonal. The diagonal of a square is a line segment that connects two opposite vertices of the square. It is also the longest possible line segment that can be drawn within the square, dividing it into two congruent right triangles.
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Oh, dude, it's called a diagonal. Yeah, like when you draw a line from one corner to the opposite corner of a square, that's the fancy term for it. It's like the square's way of saying, "I'm not just a boring ol' four-sided shape, I've got some flair with my diagonals."
diameter
line of semtry
A chord is a straight line within a circle that divides the circle into two parts - these parts are called arcs.The diameter is a chord that runs through the centre of the circle and divides the circle into two equal parts.
The midpoint divides a line segment into congruent parts.
A chord.