Question

A letter to principal is formal or informal

Answer 1

it is completely FORMAL .

Answer 2

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Formal letter-:are letters written to peoples who donot know a personal level.

Eg.we may write to find out information ,to apply job,to make a complaint,etc.

Informal letter-:An informal letter is a letter you would write to a friend,a family member or an acquaintance.The classic informal letter has five part as follow-:

Address block: Includes your return address and date of writing letter.

So, A letter to Principal is Formal letter.