Math 213 HW16: Problems from Section from Chapter 12 Review 4. Use the area formula for rectangles and the moving and additivity principles to explain why the area of the triangle in Figure 12.82 is 1. b. h square units for the given choices of base b and height h. -b 5. Determine the area of the shaded triangle in Figure 12.83 and explain your reasoning. 1 cm . 7. Explain why the area of the parallelogram in Figure 12.84 is for the given choice of base b and height h. You may u the moving and additivity principles and the area formulas for rectangles and triangles in your explanation (use an all of these).