How to use this in the classroom
Angle Pool is solo 9-ball pool with a live protractor on the cue ball and a dashed bounce-path preview that reflects off cushions. Students aim, watch the predicted path bend off cushions at equal angles, and learn the angle of incidence equals the angle of reflection by seeing it. Six levels ramp from one ball + four pockets up to a full 9-ball diamond, with a parallel-lines level that demonstrates alternate-angle equality through a transversal.
Angle vocabulary introduction
Strong opener for an angles unit. The protractor labels every aim live with the angle in degrees AND the angle class (acute, right, obtuse, reflex). Students see hundreds of examples in 10 minutes without a worksheet.
Reflection rule discovery
Project on the IWB and ask students what they notice about the dashed bounce path. The equal angles at each cushion are visible BEFORE you name the rule, which makes the formal statement (angle of incidence = angle of reflection) land as a confirmation of what they already saw.
Parallel-lines transversal
Level 4 overlays two parallel dashed guides across the table. When the cue ball crosses both on a straight segment, the equal angles are labelled. Use it as a 5-minute starter for a co-interior / alternate angles lesson.
What it builds
Angle estimation, geometric vocabulary, and an intuitive grip on the reflection rule and parallel-line transversal theorems. Most students can recite 'angle of incidence equals angle of reflection' from a textbook diagram but fail to apply it; watching it happen in a game cements the rule.
Common misconceptions it surfaces
- Reflex vs obtuse confusion — Students new to angle classification routinely mis-name angles over 180°. Rotating the cue past straight-up makes the label flip between obtuse and reflex live, training the boundary into them in seconds.
- Reflection 'mirrored' wrong — Many students predict the bounce by flipping the angle across the cushion line instead of the cushion normal. Seeing the predicted path bend the OTHER way several times in a row corrects the misconception.
- Parallel lines = same angles assumption — Level 4 surfaces this. Students predict the second crossing's angle BEFORE the ball crosses; if they get it wrong, the equality is shown explicitly. This builds the alternate-angles intuition before the formal proof.
Differentiation
- Going slower: Play levels 1 and 2 only. Focus on reading the protractor and naming the angle class for each shot.
- Going faster: Full rack: aim for sub-par on every level. Bonus challenge: sink a ball off a single cushion bounce.
- Investigation extension: Pause on level 4 with the parallel guides visible. Ask students why the two angles MUST be equal, not just empirically. Bridge to a formal proof using co-interior and alternate-angle theorems.
Pairs well with
- Skip Sprint — another arcade-format skills game
- Integer Golf — the closest cousin — aim, pull, release
- All maths games — the full library