Triangle
A triangle is a polygon bounded by three line segments joining three noncollinear vertices.
Geometry for Programmers
A polygon bounded by three line segments joining three noncollinear vertices.
- How it is used
- Represents surfaces as simple elements and supplies terminology for geometry code, mesh models, and algorithm inputs.
- How deep it goes
- Defines vertices, points, boundaries, degeneracy, adjacency, and mesh quality, but defers a full treatment of manifolds.
- Examples
- Uses vertex-and-point diagrams, on-versus-in boundary diagrams, degenerate needles and caps, and neighboring triangles in a mesh.
- What you can do after
- Evaluate triangle terminology and quality, recognize degenerate cases, and understand their consequences for mesh topology and algorithms.
Math for Web Design
A triangle is a polygon with three sides and three vertices.
- How it is used
- Supports frontend layouts, rotations, animations, directional calculations, and canvas or SVG geometry.
- How deep it goes
- Explains right-triangle side ratios, unit-circle coordinates, radians, and repeating function behavior without developing advanced geometry.
- Examples
- Uses a right-triangle diagram, unit-circle values, mouse coordinates, canvas lines, CSS rotation, and curved frontend animations.
- What you can do after
- Apply triangle relationships to calculate horizontal and vertical components, slopes, positions, rotations, and movement directions.
Related concepts
- nodehas part · A node is a discrete element in a structured system, such as a graph, tree, network, or distributed system, representing an entity, state, component, or computational unit and potentially connected to other elements.
- edgehas part · An edge is a localized image boundary where intensity, color, or another visual property changes sharply.
- hybrid modelused by · A hybrid model is a geometric representation that combines smooth surface elements and triangle mesh elements in one model or across interchangeable representations.
- degenerate triangleincludes · A degenerate triangle is a triangle with zero area because its vertices coincide or are collinear.
- signed distanceused by · A signed distance is a distance from a geometric boundary or separator assigned a positive or negative sign according to which side contains the point.
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