"Square" says it all. A square is an equilateral quadrilateral with each of the inside angles (vertices) equal to 90 degrees...it doesn't need to be described further.
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In geometry, a hypotenuse is the longest side of a right-angled triangle, the side opposite the right angle.
A square is a right angled parallelogram with 4 right angles and all opposite sides parallel.
In geometry, a square has four equal sides and four right angles. Each quarter of a square would be a right-angled triangle with one side equal to half the length of a side of the square. Therefore, there are 8 quarters in a square.
A square :-)
An equilateral right-angled triangle is an impossibility in plane geometry as it would need to have internal angles totalling 270 degrees.