Corresponding, alternate and same-side angles
- One fact gives an equality, the other a sum — 3 tasks
- What the arrowheads buy — 3 tasks
- Where the equal angles come from — 6 tasks
- One walk, one link swapped — 3 tasks
- Going Deeper — 5 tasks
- Practice — 24 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.
-
Parallel Lines & Transversals — Cut & Glue Sort 25 minutes · 5 sheets
12 marked pairs to cut out and glue into 3 bins — equal, adds to 180°, and no way to tell — and the bin that says no way to tell is the lesson: those are the pairs whose lines carry no arrowheads.
-
Parallel Lines & Transversals — Answer Maze 10–15 minutes · 4 sheets
One page, ten minutes and nothing to prepare: each box gives one angle between parallel lines and asks for another, the wrong answer on offer is always the supplement, and the row of box numbers at the foot marks the sheet in a glance.
-
Parallel Lines & Transversals — Mystery Picture 25–35 minutes · 4 sheets
25 figures and no arithmetic at all: equal, fill the square with slanted lines; adds to 180°, leave it white — and a picture appears, with a bite out of it wherever a square went wrong.
-
Parallel Lines & Transversals — Scavenger Hunt a full class period · 12 sheets
16 cards taped round the room: a group works out the angle at the foot of one card, hunts for the card whose big number at the top is their answer, and a wrong answer lands on a card that names the mistake and sends them back — so a clean run is 8 lines on the record sheet and the room needs no answer key.