What is the square root of 400?

The square root of 400 is 20.

  • Definition: The square%20root of a number is a value that, when multiplied by itself, gives the original number.

  • Calculation: 20 * 20 = 400

  • Positive Root: In this case, we're referring to the positive or principal square%20root. While (-20) * (-20) also equals 400, the principal square root is the positive one.