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The length of the diagonal is the hypotenuse of a right angle triangle where the other two legs are 16cm and 12cm
Therefore using Pythagoras's Theorem (the square of the hypotenuse is equal to the sum of the squares of the other two sides)
Diagonal squared = 16^2 + 12 ^2
Diag^2 = 256 + 144
Diag^2 = 400
Diagonal = square root 400
Diagonal = 20 cm
The answer is 20cm
Therefore using Pythagoras's Theorem (the square of the hypotenuse is equal to the sum of the squares of the other two sides)
Diagonal squared = 16^2 + 12 ^2
Diag^2 = 256 + 144
Diag^2 = 400
Diagonal = square root 400
Diagonal = 20 cm
The answer is 20cm
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