We need to find out what the root number three (√3) equals.

The root number three is an irrational number, that is to say, it cannot be expressed by the ratio of two integers. We usually use approximation to express it. The root number three is mathematically expressed as √3. In order to get its approximate value, we can use a calculator or look up a math table. The result is that the root number three (√3) is approximately equal to 1.73. So the root number three is approximately equal to 1.73.