What is the square root of 225?

The square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 225 is the number in question. When determining the square root, we are looking for a number that, when squared (multiplied by itself), equals 225.

Calculating this, we find that 15 times 15 equals 225 (15 x 15 = 225). Thus, the square root of 225 is indeed 15. This mathematical relationship illustrates why the correct answer is 15; it satisfies the definition of a square root perfectly.

Additionally, other options do not satisfy the condition, as they do not yield 225 when squared. For instance, 10 squared equals 100, 12 squared equals 144, and 18 squared equals 324, which confirms that only 15 is the correct solution in this case.