# Parallel Structure Questions and Answers (Q&A) #### sdbaker

I believe that this sentence does not use correct parallel structure. #### sdbaker

This sentence is correct because we have two clauses with one subject and one predicate ,isn't it ? #### sdbaker

It does not use the same parts of speech in each. #### sdbaker

I realised it was incorrect but how do we correct the following sentences? #### sdbaker

Correct.
It's a parallel structure because the similar ideas is being expressed with similar grammatical structure. #### sdbaker

Correct because it has no mistakes and it's parallel #### sdbaker

The radius of a circle can be calculated by measuring the diameter, and then dividing the diameter into half. This is because in theory, the radius of a circle is half of the circle’s diameter. The diameter of the circle can either be found by direct measurement or from other relations in case more variables are given.

For instance if the perimeter of a circle is given, then radius is directly found by the relation Perimeter = 2 x pi x radius. Similarly, if the area is given, then radius can be found by using Area = pi x radius squared.   