Class 7 Chapter 13: Visualizing Solid Shapes

Important Concepts and Formulas

1.      The shapes such as cubes, cuboids, cylinders, cones and pyramids are called solid shapes or three-dimensional shapes.

2.      The flat surfaces of a solid shape are called the faces and the corners are called the vertices.

3.      The line at which two faces intersect is called an edge of a solid shape.

4.      A net is a 2D outline of a 3D shape, which can be folded to make the 3D shape.

5.      There are two different types of sketches that are possible for a solid shape. They are oblique sketch and isometric sketch.

6.      An oblique sketch conveys all important aspects of the appearance of a 3D shape, though it does not have proportional lengths of its edges.

7.      In an isometric sketch of a 3D shape, the measurements are kept proportional.

8.      We can view a solid shape in different ways. A solid shape looks different if we view it from different angles.