square drill
A drill bit with a square cross-section, used in woodworking and machining.
The carpenter used a square drill to make a square hole.
regular pyramid
Abbreviation of 方錐形 (ほうすいけい). Used in geometry to refer to a pyramid with a square base.
See also: 方錐形 (ほうすいけい)
Do you remember the formula for the volume of a regular pyramid?
trigonal pyramid
regular pyramid
Compound of 方 (square) and 錐 (drill, awl, pyramid). The geometric sense is an abbreviation of 方錐形.