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Find the length of diagonal of A4 sheet by using PYTHAGORAS theorem

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Width of A4th size paper = 21 cm Height of A4th size paper = 29.7 cm Diagonal of the A4th size paper = √ width² + height ² =√ 21² + (29.7)² = √ 441 + 882.09 =√ 1323.09 = 36.374 cm
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