The crossword solution for the term 'Area of Study' is QUAD, which stands for Quadrilateral. A quadrilateral is a four-sided polygon with four angles and four sides. It is one of the most basic shapes in geometry and is used in many areas of mathematics and engineering. Quadrilaterals are also used in architecture, art, and design. They are often used to create patterns and designs, as well as to divide space into sections. Quadrilaterals are also used in physics and engineering to describe the motion of objects.