Edge — Grade 7 Accelerated, what it means and where it is taught
A flat surface; a line where two faces meet; a corner point.
Taught in Grade 7 Accelerated.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Face — A flat surface; a line where two faces meet; a corner point.
Practise this idea
2 questions in the course bank use Edge, in Plane Sections of 3-D Figures.
Problem 1
How many edges does a cube have?
Worked answer
12
4 + 4 + 4 = 12 edges.
Problem 2
A cube is sliced through the diagonal of its top face and the parallel diagonal of its bottom face. What shape is the cross section?
- A square
- A rectangle
- A triangle
- A hexagon
Worked answer
A rectangle
The plane crosses four faces, so the cross section has four sides
All four corners are right angles, but the horizontal sides are diagonals — longer than the vertical edges
So it is a rectangle, not a square.