Complex numbers are ordered pairs of numbers which are represented by two real numbers enclosed within parentheses. 

The complex numbers are separated by the non-radix character. The radix in the United States is usually represented by a period; therefore, we will represent the non-radix character with a comma. For example, an acceptable number is (2.341, 7.814). If you are not familiar with complex numbers, you may want to think of them as two-dimensional vectors or point coordinates.

Most of PentaCalc's complex number functions compute results that are meaningful in ordinary two-dimensional geometry, as well as for complex numbers.

 However, PentaCalc has some limitations. You cannot assign units to or use fractions with complex numbers. The complex number (x,y) as entered in PentaCalc can have different meanings.