Same vertex, opposite corners. Equal.
Same position at each intersection. Equal.
Between the lines, opposite sides. Z-shape. Equal.
Outside the lines, opposite sides. Equal.
Between the lines, same side. Sum to 180°.
Phase 1 — Learn: 10 focused questions per concept (50 total).
Phase 2 — Master: 150 mixed — all five at random.
Click directly on the angle wedge in the diagram to answer.
| Concept | Phase | Score |
|---|