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Given length of the rectangle = 16m 
          breadth of the rectangle = 12m
Diagonal of the rectangle = ?
we know that the diagonal of a rectangle divides it into two right angled triangles 
So , Diagonal
² = length² + breadth²(Pythagoras theorum) 
Diagonal² = (16)² + (12)²
Diagonal² = 256 + 144 = 400
Diagonal = 400 = 20m
Therefore , length of the diagonal = 20m .
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