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16 + 4 + 1 =21
That is the decimal form.
The standard form of 12 squared is 122
Expressed as a surd in its simplest form, sqrt(522) = 3 sqrt(58). Expressed as a decimal, rounded to two decimal places, √522 ≈ ±22.847Remember, a negative number, when squared is a positive.
The same as the 8th decimal place of Pi itself.