1. CENTROID 2. ORTHOCENTER 3. CIRCUMCENTER 4. CIRCUMCIRCLE 5. INCENTER 6. INCIRCLE 7. MEDIAL TRIANGLE 7A. ORTHO, MID-SEGMENT TRIANGLE 8. ORTHIC TRIANGLE 9. PEDAL TRIANGLE 10. CENTER OF NINE POINT CIRCLE 11. NINE POINT CIRCLE 12. TRISECTING A LINE SEGMENT 13. EQUILATERAL TRIANGLE, GIVEN A SIDE 14. SQUARE, GIVEN A SIDE 15. ISOSCELES TRIANGLE, GIVEN BASE AND ALTITUDE 16. TRIANGLE CENTERS (H, G, C, AND I) 17. TRIANGLE CENTERS WITH EULER LINE 18. LOCUS OF VERTEX OF A FIXED ANGLE THAT SUBTENDS A FIXED SEGMENT 19. DIVIDE A SEGMENT AB INTO TWO PARTS THAT FORM A GOLDED RATIO 20. PENTAGON, GIVEN A RADIUS 21. PENTAGON, GIVEN A SIDE 22. HEXAGON, GIVEN A SIDE 23. OCTAGON, GIVEN A SIDE