'Base' in the Bible

"And these are the measurements of the altar: Its base is 1? feet high, and 1? feet wide, and its border nine inches on its edge. This is to be the height of the altar.

From the base of the ground to the lower edge is 3? feet, and the width 1? feet; and from the smaller ledge to the larger edge, 7 feet, and the width 1? feet;

The ledge is 24? feet long and 24? feet wide on four sides; the border around it is 10? inches, and its surrounding base 1? feet. Its steps face east."