26, -26
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Because 26 squared is 676 so the square root of 676 must be 26.
The two square roots of 18 are: 4.242641 and -4.242641
The two square roots are +70 and -70 .
0.64 has square roots {0.8, -0.8}.
The unit for area is a unit of length squared. Assuming that the questioner meant 676 square centimeters, the side length is the sq rt of 676 square centimeters = 26 centimeters.