Sunday, January 29, 2017

usage of an indefinite article

I'm stuck on the sentence.




May we put an indefinite article in the sentence below if we talk about the object in general?



Here is the example:




  • Is it possible to find out the height of a triangle if we know the length of its sides?



Here is the article a after the preposition of and I'm not sure is it correct.
Could you point out my other mistakes if I made?

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