Class 7 Maths
- Shapes with three dimensions are called solid shapes.
- The corners of a solid shape are called its vertices. The line segments are called edges and flat surfaces are called faces.
- A skeleton outline of a solid that can be folded to make the solid is called a net of that solid. A particular solid can have many types of nets.
- An oblique sketch of a solid does not show proportional lengths. An isometric sketch shows proportional measurements of a solid. It is drawn on an isometric dot paper.
- Different sections of a solid can be viewed in many ways.
- It can be done by cutting or slicing the shape. This would show the cross-section of the solid.
- It can be done by observing 2-D shadow of a 3-D shape.
- It can be done by looking at the shape from different angles; like front view, side view and top view.