# Identical cubes are stacked in the corner of a room as shown below.

The number of cubes that are not visible are _________.

**Solution:**

We know that

A cube is a three-dimensional object that has 6 congruent square faces.

Dimensions of all the 6 square faces of the cube are the same.

A cube is sometimes also referred to as a regular hexahedron or as a square prism.

It is one of the 5 platonic solids.

1. A cube has 12 edges, 6 faces, and 8 vertices.

2. All the faces of a cube are shaped as a square hence the length, breadth, and height are the same.

3. The angles between any two faces or surfaces are 90°.

4. The opposite planes or faces in a cube are parallel to each other.

From the figure

20 cubes are not visible.

Therefore, the number of cubes that are not visible are 20.

**✦ Try This: **Order of rotational symmetry of acute triangle is ____.

**☛ Also Check: **NCERT Solutions for Class 7 Maths Chapter 10

**NCERT Exemplar Class 7 Maths Chapter 12 Problem 58**

## Identical cubes are stacked in the corner of a room as shown below. The number of cubes that are not visible are _________.

**Summary:**

Identical cubes are stacked in the corner of a room as shown. The number of cubes that are not visible are __20__.

**☛ Related Questions:**

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