Cecilia built a model pyramid out of foam. Her model is 20 inches high with a rectangular base that is 8 inches long and 12 inches wide what is the volume of her model in cubic inches
The volume of a rectangular pyramid can be calculated by multiplying the base area by the height and dividing it by 3.
The base area is calculated by multiplying the length by the width: 8 inches * 12 inches = 96 square inches.
Now, multiplying the base area (96 square inches) by the height (20 inches): 96 square inches * 20 inches = 1920 cubic inches.
Lastly, dividing the result by 3: 1920 cubic inches / 3 = <<1920/3=640>>640 cubic inches.
Therefore, the volume of Cecilia's model pyramid is 640 cubic inches.