Respuesta :

1400, using the right rectangular pyramid formula lwh/3 and in this case it is (20x20x10.5)/3

Answer:

We find the are of the square (base) below:

20 x 20 = 400

now we multiply it by the height:

400 x 10.5 = 4200

Now we divide by the 3:

4200 divided by 3 = 1400 in3 is your answer