〰️ AINMATH · Classroom Worksheet
Basics of Shapes — Perpendicular and Parallel
Grades 3–4 · Basics of Shapes
⏱ 15–20 min
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Learning goal — Know that two lines are perpendicular when the angle between them is 90°, and that two lines are parallel when they never meet no matter how far they're extended.
Perpendicular: two lines that meet at a 90° angle | Parallel: two lines that never meet, no matter how far extended
💻 Access on a tablet → ainmath.com/lines-angles-basics.html
1Telling Perpendicular and Parallel Apart
① When two lines meet at a 90° angle, what is their relationship called?
② What is the relationship called between two lines that never meet, no matter how far they're extended?
2Finding Examples Around Us
① Are a book's horizontal and vertical edges perpendicular or parallel to each other?
② Are the two side rails of a ladder usually perpendicular or parallel to each other?
3Think Further
Q. If you draw two perpendicular lines on a rectangular piece of paper, how many angles do they form, and how many degrees is each one?
For teachers — cover before handing out to students
Answers & Solutions
Activity 1 — ① Perpendicular ② Parallel
Activity 2 — ① Perpendicular ② Parallel
Activity 3 — 4 angles are formed, and each one is 90° (a right angle).