A square is a plane (flat) shape whose boundaries are four straight lines of equal length such that these lines meet, in pairs, at four points (vertices). At these vertices they form angles of 90 degrees. The diagonals of the square are straight lines joining opposite vertices. These diagonals meet one another.
The given statement means that the angles formed at the crossing points of the diagonals measure 90 degrees.
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No but the diagonals of a square, rhombus and a kite are perpendicular to each other
No.
Two.
none, no
Not always but they are perpendicular in a square, a rhombus and a kite in that the diagonals intersect each other at 90 degrees