1. POLYGONS: SQUARE, PENTAGON, RHOMBUS
2. ANGLES: ACUTE, RIGHT, OBTUSE
3. CIRCLE: CENTER, CHORD, RADIUS
4. PROPERTIES: SYMMETRIC, TRANSITIVE, REFLEXIVE
5. TRIANGLES: RIGHT, SCALENE, ISOSCELES
6. OPERATIONS: MULTIPLY, DIVIDE, SUBTRACT
7. UNDEFINED: LINES, PLANE, POINT
8. NUMBERS: IMAGINARY, RATIONAL, NATURAL