Parallel structure is not part of grammar, except to the extent that there are syntactic rules, like Conjunction Reduction, that apply to structures that are syntactically parallel. They're always optional rules, though, and there's no grammatical requirement to use parallel structures. They're awfully useful, though, as you point out
-BrainQuiz
Two lines will remain parallel when they are intersected by a transversal line
the reason their are parallel lines because the person who invented them thought they were compulsory for maths
Train tracks
It is not because it does not have two pairs of parallel sides.
It is possible, but not necessary. A hexagon can have 0, 2, 3, 4, 5, or 6 parallel sides. A regular hexagon has 3 parallel sides.
Topic Sentence * 1st Supporting detail/reason/fact * Explain * Explain * 2nd Supporting detail/reason/fact * Explain * Explain * 3rd Supporting detail/reason/fact * Explain * Explain Conclusion
Parallel episodes are events in the story that reoccurmore than once for a reason
This is possible, but not necessary. A regular hexagon has 3 pairs of parallel lines, making 6 parallel sides altogether.
Two lines will remain parallel when they are intersected by a transversal line
This is possible, but not necessary. A regular hexagon has 3 pairs of parallel lines, making 6 parallel sides altogether.
when velocity of a car is increasing then velocity and acceleration are parallel to each other.
because tri- means 3 and so it cant have parallel sides.
the reason their are parallel lines because the person who invented them thought they were compulsory for maths
Enlightenment Thinkers used the power of reason to explain how society works.
no explain the reason for the Texas love of the treaty oak
Nothing is parallel to any meridian. The equator is a parallel of latitude, and is parallel to all the other parallels. This is a big part of the reason that, collectively, they are called 'parallels'.
Train tracks