9. a. Determine the areas (in square units) of the 4 lightly shaded triangles in Figure 12.54. The grid lines are 1 unit apart. Explain your reasoning. b. Use the moving and additivity principles and your results from part (a) to determine the area of the dark shaded quadrilateral in Figure 12.54. Explain your reasoning. FIGURE 12.54 Four triangles and a quadrilateral forming a rectangle 10. Determine the area (in square units) of the quadrilateral in Figure 12.55 in two different ways. The grid lines are 1 unit apart. Explain your reasoning. FIGURE 12.55 Determine the area of the quadrilateral.
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54. - Count the base and height of each triangle using the grid lines (each unit is 1 square unit). - Use the formula for the area of a triangle: Area = 0.5 × base × height. Show more…
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