Distance from a point to a line; distance between parallel lines
- The number on the listing — 3 tasks
- Ana and Ben pick the closest point — 3 tasks
- Which segment counts as the distance — 3 tasks
- Measuring across two parallel lines — 3 tasks
- Going Deeper — 6 tasks
- Practice — 23 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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Which Segment Is the Distance? — Cut & Glue Sort 25 minutes · 5 sheets
12 figures and not one number: cut them out and sort them by whether the drawn segment is the distance from the point to the line, whether the figure refutes it, or whether nothing on it decides — the little square is the only thing that can say.
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Which Segment Is the Distance? — Answer Maze 10–15 minutes · 4 sheets
One page and nothing to prepare: two segments run from the point to the line and only one of them is the distance, and picking it is what sends you on — the row of box numbers at the foot marks the sheet in a glance.
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Distance from a Point to a Line — Mystery Picture 25–35 minutes · 4 sheets
25 figures and not one number: is the segment drawn from the point really the distance to the line? Fill it with slanted lines if it is, leave it white if it runs past, stops short or has no right-angle mark, and a picture appears.
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Which Segment Is the Distance? — Scavenger Hunt a full class period · 13 sheets
16 cards round the room and not a number on any of them: two segments run from the point down to the line, only one is the distance, and the name of the one you pick is the top of the card you go to next — pick the wrong one and you land on a card that names the mistake and sends you back, so a clean run is 8 lines.