9.4
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The square root of 89 is halfway between the square root of 81 = 9 and the square root of 100 = 10. Rounded to two decimal places, the square root of 89 is equal to 9.43.
14.2
sqrt(356) = sqrt(4*89) = sqrt(4)*sqrt(89) = 2*sqrt(89)
The square root of 7921 is 89.
Providing it's a right angle triangle use Pythagoras' theorem: 252+402 = 2225 and the square root of this is about 47.16990566 meters The exact answer is 5 times the square root of 89