Yes.

It is the rounding method. Different places have different regulations. Sometimes the rounding method is used. When you talk about rounding, most of the time you use Gaussian rounding, which means rounding to the largest integer not larger than the decimal, for example:

1.998 is rounded to 1.

-1.2 is rounded to -2.

What should be noted is the situation when the number is negative.

For example:

The small side 255 except the big side 1005=tan0.2537313.

Similar to this situation, if the tan value is used as a reference, it will be cumbersome to calculate the large and small sides with these decimal points. Therefore, in order to appropriately remove similar decimal points without affecting the accuracy of the actual size, I will introduce here the rounding calculation method in mathematics.