The term 'GEOMETRY CLASS CALCULATION' can be broken down into two parts: the first part is 'Geometry Class, ' which refers to a course of study in mathematics that focuses on the properties and relationships of points, lines, angles, surfaces, and solids. The second part is 'CALCULATION, ' which means to determine or compute a numerical result. The crossword solution for this term is 'AREA, ' which is a measure of the size of a surface or region.