RBSE Solutions Class 6 Maths Chapter 10 Understanding Three Dimensional Shapes More Ques

🎯 Exam Tip: When categorizing objects by their surfaces, carefully observe each part of the object to identify all types of surfaces present.

Text Book Questions

(Page No. 153)

Question 1. Observe each match box surface and answer the following questions.
(i) How many surfaces are there in a cuboid?
(ii) What is the shape of each surface?
(iii) How many edges are there in the match box?
(iv) How many vertices are there in a cuboid?
Answer:
(i) A cuboid has a total of 6 surfaces.
(ii) Each surface of a cuboid is shaped like a rectangle.
(iii) A matchbox, which is a cuboid, has 12 edges.
(iv) A cuboid has 8 vertices. These are the points where the edges meet.
In simple words: A cuboid, like a matchbox, has 6 flat sides, each shaped like a rectangle. It has 12 straight lines where the sides meet (edges) and 8 corners (vertices).

🎯 Exam Tip: Remember the key features of a cuboid: 6 rectangular faces, 12 edges, and 8 vertices. Visualize a common object like a brick or a matchbox to recall these properties easily.

Think And Discuss

(Page No. 155)

Question 1. What are the differences between a circle, a sphere, and a cylinder?
Answer: A circle is a flat, two-dimensional shape. In contrast, a sphere and a cylinder are three-dimensional shapes that take up space. The entire outside of a sphere is curved, like a ball. A cylinder, on the other hand, has one curved side and two flat, circular ends. This difference in dimensions is key to understanding how they exist in space.
In simple words: A circle is flat; a sphere and cylinder are solid. A sphere is all curved. A cylinder has a curved side and two flat, round ends.

🎯 Exam Tip: Differentiate between 2D shapes (like circles, which are flat) and 3D shapes (like spheres and cylinders, which have volume) by considering their dimensions and types of surfaces.

(Page No. 156)

Question 1. Which of the following have all flat surfaces?
Answer: The objects that have only flat surfaces are: a name plate, an ice cube, a geometry box, a brick, a dice, and a notebook. A flat surface is a smooth, even area that does not curve.
In simple words: From the given pictures, the things that have only flat sides (no curves) are the name plate, ice cube, geometry box, brick, dice, and notebook.

🎯 Exam Tip: To identify objects with all flat surfaces, imagine if you could lay the object perfectly flat on a table on any side without it rolling or having a curved part lift off.