sqrt(45) = sqrt(9 x 5) = 3 sqrt(5)
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one over the square root of 2 or 0.850903525
First you have to set up a proprtion. 45 over x equals x over 5. Then you get x squared equals 225(45*5). Finally you have to find the square root of 225 which is 15.
1/square root 2
5 square root of 2 units
The length of either leg is the square root of 60.5, or about 7.8 (either leg has a length equal to the square root of 121/2).This can also be found by formula to be c/sqrt 2 or 11/[sqrt 2].7.78