Angle pairs: complementary, supplementary, linear pair, vertical
- Two angles, two pictures — 3 tasks
- Who is right about 130 and 50 — 3 tasks
- Neighbours and opposites at a crossing — 3 tasks
- Four pictures, one linear pair — 3 tasks
- What an unmarked figure gives you — 4 tasks
- Practice — 26 tasks
- Summary — 2 tasks
- Cool-down — 3 tasks
Classroom activities
Things a class does rather than writes on. Each one is a finished PDF: print it, cut it up if it says so, and hand it round.
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Complementary, Supplementary, or Neither — Cut & Glue Sort 25 minutes, including the cutting · 5 sheets
12 small crossings to cut out and glue into 3 rows — the two marked angles must add to 180°, must add to 90°, or there is no way to tell — and the row that cannot be told holds the crossings drawn a few degrees off square with nothing marked, which is the difference this lesson exists to teach.
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Angle Pairs — Answer Maze 10–15 minutes · 4 sheets
One page and nothing to prepare: 8 crossings, one angle given and one asked, and at every box the choice the lesson turns on — equal, add to 180°, or add to 90° — with the wrong choice leading to a box that sends you back, and the row of box numbers at the foot to mark it by.
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Vertical Angles — Mystery Picture 25–35 minutes · 4 sheets
25 figures and no numbers: fill the square with slanted lines where the two marked angles must be equal — the opposite angles of two lines, or two angles a square makes right angles — and leave it white where they only look equal.
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Angle Pairs — Scavenger Hunt a full class period · 13 sheets
16 cards round the room: each gives one angle at a crossing and asks for another, and a group decides first whether the two are equal, add to 180° or add to 90° — a wrong choice lands on a card that sends it back, so a clean run is 8 lines on the record sheet.