Rectangular Coordinate System on a Plane
Прямоугольная система координат на плоскости
The rectangular coordinate system (also called the Cartesian coordinate system) is a way to locate any point on a flat surface using two numbers. It's like giving every point on a plane its own unique "address"!
1. What is a Coordinate Plane?
A coordinate plane (координатная плоскость) is formed by two perpendicular number lines that intersect at their zero points:
- X-axis (ось абсцисс) — the horizontal number line
- Y-axis (ось ординат) — the vertical number line
- Origin (начало координат) — the point where both axes cross, labeled O
Key Idea: Together, these two axes form the rectangular coordinate system (прямоугольная система координат).
Interactive visualization — available in the full lesson
2. Elements of the Coordinate Plane
| Element | Description |
|---|---|
| Origin O | Intersection point at (0, 0) |
| X-axis | Horizontal line; positive to the right |
| Y-axis | Vertical line; positive upward |
| Unit segments | Equal spacing marks on both axes |
| Arrows | Show positive directions |
Interactive visualization — available in the full lesson