Geometry

Geometry Terms & Relationships

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‎- Point: Exact location; no length, width, or height — named with a capital letter (e.g. Point A)

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‎- Line: Straight, endless set of points; extends infinitely in two opposite directions — named with two points or one lowercase letter (AB  or line m).

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‎- Plane: Flat, 2‑D surface with length + width; extends infinitely in all directions — named with 3 non‑collinear points or one capital letter (Plane X).

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‎- Parallel Lines: Coplanar lines that never intersect; stay equal distance apart — symbol  ∥ 

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‎- Perpendicular Lines: Intersect at exactly 90° (right angle) — symbol  ⊥ 

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‎- Line Segment: Part of a line with two fixed endpoints; measurable length.

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‎- Ray: Starts at one endpoint, extends infinitely in one direction.

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‎- Opposite Rays: Share one endpoint, form a straight line going opposite ways.

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‎- Opposite Rays: Share one endpoint, go in exact opposite directions, form a straight line.

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‎- Angle: Shape formed when two rays meet at a shared endpoint (vertex).

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‎- Naming Angles: Vertex letter always in the middle

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‎Geometric Construction of;

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‎- Parallel lines: Keep equal spacing, never cross — drawn with matching tick marks.

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‎- Perpendicular lines: Cross to make a perfect square corner / 90°.

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‎- Intersecting lines: Cross at one point and create angles that you name from that intersection.