## Space and Properties of Space Terms

**Axis (axes):**A reference line (or pair of lines) from which distances are measured on a coordinate grid.

**Clockwise:**In the same direction as the rotation of the hands of a clock.

**Collinear:**A set of points lying in a straight line.

**Coordinate grid:**A 2-dimensional grid in which location is described by its distances from the X and Y axes.

**Coordinates:**An ordered pair of numbers that gives the location of a point in a coordinate grid.

**Coplanar:**In the same plane.

**Having exactly the same size and shape.**

Congruent:

Congruent:

**Counter-clockwise:**In a direction opposite to the direction that the hands of a clock rotate.

**Horizontal:**Parallel to the horizon.

**Intersect:**To cross over one another.

**Mid-point:**The middle point of a line segment.

**Origin:**The intersection of the X-axis and the Y-axis in a coordinate plane. Its coordinates are (0,0).

**Parallel lines:**Lines that never meet no matter how far they are extended.

**Perpendicular:**Forming right angles.

**Perpendicular bisector:**A line that divides a line segment in half and meets the segment at right angles.

**Plane:**A flat surface. A plane extends indefinitely in all directions.

**Point:**An exact location in space.

**Quadrant:**

• Any of the four sections of a coordinate grid that are separated by the X and Y axes.

• A quarter of a circle or its circumference.

**Vertical:**Perpendicular to the horizon.

**The horizontal axis of the graph.**

X - Axis:

X - Axis:

**The vertical axis of the graph.**

Y - Axis:

Y - Axis:

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