Sasha's grandmother loves to travel. she sends sasha postcards from all around the world. sasha keeps the postcards in a special box. the box has a square base and a square pyramid for a lid. what is the combined volume inside the box and lid?

To find the total volume of the box, you will find the volumes of each separate piece.

Use the formulas for finding the volumes of each:

V = 1/3 Bh (pyramid);  B stands for the area of the base shape
      1/3 x 8 x 8 x 3
V = 64 cubic inches

V = Bh (prism)
      8 x 8 x 4
V = 256 cubic inches

256 + 64 = 320 cubic inches

The total volume of the box is 320 cubic inches.