Find the number of rectangles 5x5 square matrix (A square is also considered a rectangle)

• 6 line use
  so mC2 * nC2
  =6C2 *6C2
  =(6*5/2) * (6*5/2)
  =225
  
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• there can be 36 unique diagonal points.and each square has 4 unique diagonal.so 36*25/4=225
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• 25+16+8+4+1=54
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• Number of rectangles= ((n*(n+1))^2)/4
  So here n=5
  Substitute value,we will get rectangles 225
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