Question

Which of these is NOT a 3-dimensional shape?
A. Sphere
B. Cuboid
C. Cube
D. Circle

Answer 1

Hint:
We know that a 3-D shape is the one that uses all the three axes for its formation, that is it uses x,y, and z-axis to exist, whereas a 2-D shape is the one that uses only two axes for its formation. Hence, now we will see the number of axes used by the given choices and will search for the one which does NOT use 3 axes for its formation, to get to the final answer.

Complete step by step solution:
According to the question, we know that for

Option 1: Sphere
Number of axes used for formation is 3
Hence, it is a 3-dimensional shape,
Therefore, option 1 is Eliminated.

Option 2: Cuboid
Number of axes used for formation is 3
Hence, it is a 3-dimensional shape,
Therefore, option 2 is Eliminated.

Option 3: Cube
Number of axes used for formation is 3
Hence, it is a 3-dimensional shape,
Therefore, option 3 is Eliminated.

Option 4: Circle
Number of axes used for formation is 2
Hence, it is not a 3-dimensional shape,
Therefore, option 4 is Selected.

Hence, our final answer is D.

Note:
In questions like these, we should carefully observe that the question has a NOT in it, this changes the meaning of the question totally, we may in a hurry read the question and understand the question as which is the 3-D shape out of them, hence we should read the question carefully to avoid getting the wrong answer for such a simple question.