CHAPTER 1 · RESOURCES
LOCATE — Concept Note
Think first. Use AI purposefully. Verify always.
A concise revision of the approved lesson. For discovery, interaction and guided reasoning, return to the lesson.
CONCEPT
Why Do We Need Coordinates?
Key Ideas
- Position is described relative to an agreed reference.
- A grid uses two crossing families of lines to organise locations.
- In a plane, one horizontal value alone does not fix the vertical position.
Formula / Property
Agree on the reference, unit spacing and order. Give the horizontal location first, then the vertical location.
Visual / Diagram
Mini Example
On a grid measured from O, a marker is 2 units right and 3 units up. How can a friend find it?
Both pieces of information are needed: horizontal 2, vertical 3.
Common Mistake
Giving a column twice does not supply the missing row. Agree on the reference, scale and order.
Quick Recall
Two markers share column 1. One is on row 2 and one on row 4. What extra information tells them apart?
Check your reasoning
The row: 2 or 4. A shared column does not mean a shared position.