Mapping Reiaan's Room: Exercise Set 1.1

Now we put everything you have learned to use.

The diagram below shows Reiaan's room — the same one Shalini built a tactile map for two pages ago — laid out on a Cartesian coordinate grid. The unit on the grid is one foot.

The corners of the room are labelled:

• O = (0, 0) — the bottom-left corner of the room (and the origin of our coordinate system)
• A = (12, 0) — the bottom-right corner, 12 feet along the floor from O
• B = (12, 10) — the top-right corner
• C = (0, 10) — the top-left corner

The left wall of the room sits along the y-axis. The bottom wall sits along the x-axis. So the y-axis is, quite literally, the left wall of Reiaan's room — and the x-axis is the floor's bottom edge as you look down on the floor plan.

Many other points are labelled inside: $W_1, W_2, W_3, W_4$ are the four corners of the wardrobe; $S_1, S_2, S_3, S_4$ are the four corners of the bed; $D_1$ and $R_1$ are the two ends of the room door; $B_1$ and $B_2$ are the two ends of the bathroom door (which sits along the y-axis itself, on the left wall).

We will use these labelled points to answer the questions of Exercise Set 1.1.