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8 multiple-choice questions and 14 flashcards on Parallel and Perpendicular Lines, about 5% of the High School Geometry bank. Every one carries a written rationale.
Parallel and Perpendicular Lines is one of 13 chapters in CoStudy's High School Geometry bank, and it holds 8 of the bank's 150 multiple-choice questions — roughly 5% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
1 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Two parallel lines are cut by a transversal. The two angles on the same side of the transversal between the parallel lines are called:
Answer: D — Co-interior (same-side interior) angles — sum to 180°
Parallel lines cut by transversal create 8 angles with relationships: corresponding (equal), alternate interior (equal), alternate exterior (equal), co-interior/same-side interior (supplementary, sum 180°), vertical angles (equal). Memorize.
4 cards from the 14 in this chapter.
What's the surface area of a cube with side 6?
216 sq units. (6 × 36.)
What's a 'transversal'?
A line that crosses two or more other lines.
What are 'parallel lines'?
Lines that never intersect — same slope.
What is an 'equilateral triangle'?
All three sides equal AND all three angles equal (60° each).
These are a sample. The full Parallel and Perpendicular Lines chapter runs 22 items with per-chapter progress tracking, on the web and in the iOS app.
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