How can the area of this triangle be determined by forming a rectangle? Select from the drop-down menus to correctly complete the statements. Triangle to form a rectangle. The length of the rectangle is 2. 4. 9. 18. The width of the rectangle is. 2. 4. 9. 18. The area of the rectangle is. 9. 18. 22.36. The area of the triangle is half the area of the rectangle so the area of the triangle is. 9. 18. 22. 35.