Question

Which of the following pictures is not a 3D figure?
A

B

C

D

Answer 1

Hint: We should analyse each and every figure given in the options and depending on certain features, we need to determine if the given figure is a 3D figure or not.

Complete step by step answer:
Let us consider the first figure in the given question. Looking at the dimension, we can see that the given figure is a sphere. We say this is a sphere since this has certain regions reflecting different amounts of light. Sphere is a 3D geometrical figure; therefore, this isn’t the correct option.
Next, we look at option B. We can see that the second figure is a conical pyramid. We know that any figure with 3 dimensions is a 3D figure. This figure has a circle as its base which consists of two dimensions. It also has a conical peak which is its third dimension, indicating that it is a 3D figure since it has 3 dimensions.
Considering option C, we know that this figure is a cuboid. Therefore, since this figure has all length, breadth and height, this is a 3D figure. So, this is not the correct answer.
Consider the next option D. We can see the figure has only 2 dimensions which are its length and breadth. There is no third dimension which is its height. This figure as we know is a rectangle and a rectangle is a 2 dimensional or 2D figure.

So, the correct answer is “Option D”.

Note: It is important to know the basic shapes and their dimensions. It provides the basics for any problem in geometry and can be very useful in obtaining the important parameters such as length, breadth, etc.