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Diagonally opposite angles of a rectangle or square is one example.
To make a square with two lines going through it, first draw a square. Then, to create the lines, draw one line diagonally from one corner of the square to the opposite corner, and another line diagonally from the other two corners. This will create an "X" shape inside the square, effectively dividing it into four triangular sections.
The 'long' diagonals are those two that run from one corner square diagonally across the board to the square in the opposite corner. They are the diagonals a1-h8 & h1-a8.
Move two adjacent coins, leaving the other pair of adjacent coins untouched. Place them on opposite sides of the unmoved pair, so that they become diagonally opposite corners of the new square.
There are an infinite number of points on two adjacent sides of a square which can be joined to the diagonally opposite point, so there is an infinite number of ways of halving a square.
A right-angle triangle is half of a square or rectangle. Draw a square or rectangle and draw a line from one corner to the corner diagonally opposite. You now have two triangles of the same area.
In chess, a pawn can move diagonally by capturing an opponent's piece that is one square diagonally in front of it. This is the only way a pawn can move diagonally.
When you cut a cube diagonally, the cross-section formed is a square. This is achieved by slicing through the cube from one vertex to the opposite vertex, passing through the midpoints of the three connecting edges. The size of the resulting square will depend on the length of the cube's sides, but it will always have equal sides and right angles, maintaining the properties of a square.
Its a right-angle triangle
To make a square with paper, fold one corner of the paper diagonally to the opposite corner, creating a triangle. Then, fold the two outer corners of the triangle inwards towards the center, creating a square shape. Press down on the folds to secure the square shape.
To make a paper square, first fold one corner of the paper diagonally to the opposite edge to create a triangle. Then, cut off the excess paper along the straight edge of the triangle. Finally, unfold the paper to reveal a square shape.