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Question
Open your geometry box. There are some drawing tools. Observe them and complete the following table:
| Name of the tool | Number of lines of symmetry |
| (i) The Ruler | ______ |
| (ii) The Divider | ______ |
| (iii) The Compasses | ______ |
| (iv) The Protactor | ______ |
| (v) Triangular piece with two equal sides | ______ |
| (vi) Triangular piece with unequal sides | ______ |
Solution
| Name of the tool | Number of lines of symmetry |
| (i) The Ruler | Two |
| (ii) The Divider | One |
| (iii) The Compasses | Zero |
| (iv) The Protactor | One |
| (v) Triangular piece with two equal sides | One |
| (vi) Triangular piece with unequal sides | Zero |
Explanation:
(i) Ruler
It has two lines of symmetry.
(ii) Divider
It has one line of symmetry.
(iii) Compass
Since, both the sides of a compass are not identical. Therefore, it has no line of symmetry.
(iv) Protractor
Since, a protactor has a shape of semi-circle and a semi-circle has only one line of symmetry.
(v) Triangular piece with two equal sides
It has one line of symmetry.
(vi) Triangular piece with unequal sides
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