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Justwannalearn
The square root of 20 is irrational.
42 is 16, less than 20 and 52 is 25, more than 20.
DarkBlue
√20=√4*√5=2√5
√5-is a irrational number 
===>2√5-is a irrational number =>√20 is a irrational number. :D
Have a nice day!!~~~ ^-^

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