A line segment where two faces of a solid meet. A cube has 12 edges.
例文
話し言葉 Count the edges on this cube: four on top, four on the bottom, and four going up the sides. That's 12. この立方体の辺を数えてみよう。上に 4 本、下に 4 本、縦に 4 本で、12 本。
書き言葉・答案 Each edge of a cube is 5 cm long. Find the sum of the lengths of all its edges. 立方体の 1 辺の長さが 5 cm のとき、すべての辺の長さの和を求めよ。
言い間違えやすいところ
英語では、立体の辺は edge と言い(立方体の辺は 12 edges。面・頂点と並べて faces, edges, and vertices)、多角形の辺の side(エントリ side)とは呼び名が違う。ただし立方体の辺の長さは edge length のほかに side length とも言う(IM Grade 6 は a cube with side length s、OpenStax Prealgebra 9.6 は cube with sides of length s と書く)。
edge of the cube | edge of a cube | edge length | edge of the prism | edge of a polyhedron | faces, edges | faces and edges | edges and vertices | edges, and vertices2
書き言葉計 5
edge of the cube | edge of a cube | edge length | edge of the prism | edge of a polyhedron | faces, edges | faces and edges | edges and vertices | edges, and vertices5