Mathematics Class 7
Parallel and Intersecting Lines
Crossing and parallel lines, square corners, angle pairs, and bends between parallels.
14 lessons · ~76 min total
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Lessons in this topic
- 0 Start here Lines that cross once, lines that never do, the four angles at a crossing, and the eight a third line makes. · 3 min You are here
- 1 Cross once, or never cross Two straight lines on a flat page meet at exactly one point, or they never meet at all. · 5 min
- 2 What parallel really means Parallel lines never meet, and the gap between them is the same everywhere. · 5 min
- 3 The four angles at a crossing Where two lines cross, the two angles facing each other across the point are equal. · 5 min
- 4 Angles that fill a straight line Pieces side by side on a straight line add to exactly 180°, and pieces round a point add to exactly 360°. · 5 min
- 5 One line laid across two A transversal makes eight angles, and three named pairs are worth knowing by sight. · 6 min
- 6 Only when the lines are parallel The famous angle facts hold on parallel lines and on no others, and one degree is enough to break them. · 6 min
- 7 Finding an angle nobody measured Chain the facts one step at a time, and each step has to name the fact it used. · 6 min
- 8 Square corners: perpendicular lines Lines that cross with all four angles equal meet at 90°. They are perpendicular. · 6 min
- 9 Parallels from square corners Two lines square to the same line are parallel. A set square or a fold draws them. · 7 min
- 10 A bend between two parallels Draw a parallel through the bend. The bend is the sum of the two marked angles. · 7 min
- 11 Checkpoint: square corners and bends A quick graded check on perpendicular lines, parallels from square corners, and bends between parallels. · 5 min
- 12 The big picture Ten ideas, tied back together. · 3 min
- 13 Track quiz Cheat-sheet table plus a reveal quiz — one question per idea. · 7 min
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