Find the value of $m \times n$ if :

$m :$ Number of lines of symmetry of regular heptagon

$n :$ Number of lines of symmetry of regular nonagon

63

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56

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42

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64

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Solution

The correct option is A $63$
Number of lines of symmetry in a regular polygon is equal to number of sides of the polygon.

So, number of lines of symmetry of regular heptagon $(m)$ = 7

and number of lines of symmetry of regular nonagon $(n)$ = 9

$∴ m \times n = 7 \times 9 = 63$

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