CAD tip # 6381:

When defining the arithmetic expressions - see Fields > All > Expression - you can use the following functions:

• +, -, *, /, ^, () = basic arithmetic operations
• sin(angle) = Sinus of an angle
• cos(angle) = Cosinus of an angle
• tang(angle) = Tangens of an angle
• asin(real) = Arcus sinus
• acos(real) = Arcus cosinus
• atan(real) = Arcus tangens
• ln(real) = Natural logarithm
• log(real) = Decimal logarithm
• exp(real) = Natural power
• exp10(real) = Decimal power
• sqr(real) = Square
• sqrt(real) = Square root
• abs(real) = Absolute value
• round(real) = Rounded to the nearest integer
• trunc(real) = Truncated to integer
• r2d(angle) = Angle in radians converted to degrees
• d2r(angle) = Angle in degrees converted to radians
• pi = Pi constant (Ludolf's number)

Example: =atan(pi)

Right-click in the Expression panel of the FIELD dialog and use Insert field... to nest (combine) field expressions and add, subtract, muliply, divide, etc. multiple fields. So you can e.g. multiply the area of the selected closed polyline and its thickness to get the dynamic value of its volume (rt-click, Insert field, object property Area * rt-click, Insert field, object property Thickness). Use "(none)" for formatting the numeric fields.