Lesson 1 · Coordinates on the Grid — Knowledge ChecksAnswer key

In the coordinate (2, 3), what does the 2 mean?

1. A.The column — 2 steps right
2. B.The row — 2 steps down from the top✓
3. C.The total number of steps
4. D.Nothing — the order is flexible

Row comes first. (2, 3) means row 2 (two down), column 3 (three right).

Are (2, 3) and (3, 2) the same position?

1. A.Yes — same two numbers
2. B.No — (2,3) is row 2/col 3, and (3,2) is row 3/col 2 — different spots✓
3. C.Only on a square grid
4. D.Yes, if the robot is facing north

Order matters. Swapping the numbers names a completely different intersection.

How many steps from (0, 0) to (3, 2), moving only along grid lines?

1. A.5✓
2. B.6
3. C.1
4. D.3

3 rows down + 2 columns right = 5 steps. That sum is the Manhattan distance.

The robot is at (1, 2). What position is directly below it (one row down)?

1. A.(1, 3)
2. B.(2, 2)✓
3. C.(0, 2)
4. D.(2, 3)

Moving down increases the row by 1 and leaves the column alone: (1, 2) → (2, 2).