Quick Answer

√21

√21 = 4.5825757. The square root of 21 is the number that, when multiplied by itself, equals 21. √21 = 4.5825757.

4.5825757

√21 = 4.5825757

How to Calculate √21

The square root of 21 is the number that, when multiplied by itself, equals 21. √21 = 4.5825757.

Find x where x² = 21√21 = 4.5825757

Verification4.5825757 × 4.5825757 ≈ 21

√21 = 4.5825757

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