Find the ratio of the following and fill in the blanks:
$21 t o 21 =$ _______

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Solution

Ratio of $21 t o 21 =$ $21 : 21$
$21 : 21$ can also be written as $\frac{21}{21}$
The lowest form of ratio $21 : 21$ $= \frac{21}{21} = \frac{\frac{21}{21}}{\frac{21}{21}} = \frac{1}{1}$ ( Divide both $21$ and $21$ by their HCF $21$ )
Hence, the ratio of $21 t o 21 =$ $1 : 1$

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Question 21

Fill in the blanks to make the statements true.

The number of lines of symmetry in a rectangle and a square are ____ (equal/unequal).

Row A	$11$	$16$	$21$	(i)	$28$
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