√78
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78.0
If T2 = 78, then T = 78(1/2) or the square root of 78, or about 8.83.
They are +/- 8.8
9 (92 = 81)
Expressed as a surd in its simplest form, sqrt(312) is equal to 2 sqrt(78). Expressed as a decimal, rounded to two decimal places, sqrt(312) is equal to ±17.66.