The square root of 10.2 is 3.19374388
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No, it is not.
The square root of (any number that isn't a perfect square) is irrational.
Yes, 102 isn't a square number (1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144) so the square root of 102 will keept going forever and is irrational.
Use Pythagoras' theorem: 102-(5 times the square root of 3)2 = 25 and the square root of this is 5 Answer: 5 cm
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