Page 253 - Start Up Mathematics_6

The answer can be checked by putting a mirror on the line of symmetry and verifying
whether we obtain a complete figure or not. You can also fold along this line to see
whether the two parts coincide or not.

Example 14: Complete each figure such that the resulting figure has the given dotted line(s) as
line(s) of symmetry. Name the complete figure so formed. How can we verify its
correctness?

(a) (b)

Solution:
(a) (b)

Circle
Cross
We shall use mirror images or paper folding technique to verify its correctness.

EXERCISE 13.3

1. Find the number of lines of symmetry in each of the following shapes. How will you check
your answers?

(a) (b) (c) (d) (e)

2. Letters of the alphabet are shown along
with a vertical line in the adjoining
squared paper. Take the mirror image
of the letter in the given line. Find
out which letters look the same after
reflection (i.e., which letters look the
same in the image) and which do not. Can you guess why?

Try for C O E M N P H L T S V

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