Question

Choose the correct alternative to the following question:

Which of the following is $3$-dimensional?

• A. planes
• B. solids
• C. lines
• D. points

Answer 1

The correct option is B

solids

Step$1$: Explanation for the correct option :

Option$\mathrm{B}$: We know that the figures such as cube, cylinder, sphere, etc., which have three dimensions, namely length, breadth, and height are called $3$-dimensional figures or solid figures.

Therefore, solids are $3$-dimensional.

Step$2$: Explanation for incorrect option :

Option$\mathrm{A}$, $\mathrm{C}$and $\mathrm{D}$

We know that the figures such as triangles, rectangles, circles, etc., which have only two dimensions, namely length and breadth are called $2$-dimensional figures or plane figures.

Therefore planes, lines, and points are not $3$-dimensional figures.

Hence option $\mathrm{B}$ is the correct option.