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Subsection 2.2.2 Plane of Symmetry
Activity 2.2.2 .
Consider the activity below illustrating plane of symmetry of a cube.
There are
\(9\) planes of symmetry in a cube as you can see in the images above.
\(2\) vertical planes of symmetry.
\(1\) horizontal plane of symmetry.
\(6\) diagonal planes of symmetry.
Plane of symmetry is an imaginary flat surface that divides an object into two equal halves, such that one half is the mirror image of the other half.
When you cut a banana vertically into two equal halves such that one half is the reflection of the other half, you create a plane of symmetry of the banana.
Example 2.2.3 .
How many planes of symmetry does a square based pyramid have?
Solution .
A square based pyramid has
\(4\) planes of symmetry as shown below.
Exercises Exercises
1. How many planes of symmetry are there in the following geometrical objects.
2. Find planes of symmetry for objects around the school.
3. Identify fruits and vegetables that have planes of symmetry.
Checkpoint 2.2.4 .
