1.
square pyramid; rectangular pyramid
A pyramid with a quadrilateral base (typically a square or rectangle) and four triangular faces meeting at an apex. A standard solid figure introduced in middle-school geometry, familiar as the shape of the Pyramids of Giza.
四角錐の体積を求める。
Find the volume of the square pyramid.
ピラミッドは四角錐の形をしている。
A pyramid is shaped like a square pyramid.
四角錐の体積は、底面積×高さ÷3で求められる。
The volume of a square pyramid is found by multiplying the base area by the height and dividing by three.
数学の授業で、四角錐の展開図をかく練習をした。
In math class, we practiced drawing the net of a square pyramid.
Composed of 四角 (quadrilateral, square) and 錐 (cone, pointed solid). The suffix 錐 is used productively in geometric terms for pyramids and cones.
USAGE:
A technical term in geometry, appearing mainly in math textbooks, lesson materials, and science writing. Like most Japanese geometric-solid names, it is formed with a base-shape name plus 錐.
COMMON COLLOCATIONS:
- 四角錐の体積: volume of a square pyramid
- 四角錐の表面積: surface area of a square pyramid
- 四角錐の展開図: net (unfolded diagram) of a square pyramid
- 正四角錐: right square pyramid (with a square base and apex directly above the center)
RELATED GEOMETRIC SOLIDS:
- 三角錐: triangular pyramid, tetrahedron
- 円錐: cone (circular base)
- 角錐: pyramid (general term)
- 四角柱: rectangular prism — the prism counterpart to 四角錐
- 立方体: cube — another common solid figure