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Actual height of chimney=12m=12*100 cm=1200cm

height of model of chimney=9cm

Using unitary method

If actual height of chimney is 1cm then height of model of chimney=9/1200 cm =0.0075cm

So height of model of a object of 1cm height=0.0075cm

Now we have been given that height of factory is 28m=2800cm

the height of model of factory= height of factory x height of model of height 1cm

=2800*0.0075cm=21cm=0.21m

height of model of factory=0.21m

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Grammar in English language provides us with set of rules to efficiently communicate with others. Without grammar we would not be able convey our thoughts accurately and might lead to misunderstandings.

Grammar establishes guidelines for using words, phrases, and punctuation consistently, which makes it easier for readers or listeners to understand our message. Consistency in grammar also helps in maintaining coherence and flow in written and spoken language.

So learning grammar is very important aspect of learning English.