Answer:
180ft³
Step-by-step explanation:
The volume of a pyramid can be calculated as the base area of the pyramid multiplied by its height, divided by 3. The height here is given as 9ft but the base area has to be calculated. Fortunately this is simple. The base area is calculated as the length multiplied by the width divided by 2 of the bottom triangle.
Area of bottom triangle = 12ft * 10ft / 2 = 60ft²
Volume of pyramid = 60ft² * 9ft / 3= 180ft³
