[{"n": "Shape", "u": "/e/geometry-and-shapes/shape/", "s": "Geometric information remaining after removing location, scale, orientation, and reflection."}, {"n": "Square", "u": "/e/geometry-and-shapes/square/", "s": "A regular quadrilateral with equal sides and right angles."}, {"n": "Triangle inequality", "u": "/e/geometry-and-shapes/triangle-inequality/", "s": "A fundamental theorem on triangle side lengths."}, {"n": "Tessellation", "u": "/e/geometry-and-shapes/tessellation/", "s": "Tessellation covers surfaces with shapes, no gaps or overlaps."}, {"n": "Tetrahedron", "u": "/e/geometry-and-shapes/tetrahedron/", "s": "A polyhedron with four triangular faces and four vertices."}, {"n": "Solid geometry", "u": "/e/geometry-and-shapes/solid-geometry/", "s": "Geometry of three-dimensional Euclidean space and solid figures."}, {"n": "Sphere", "u": "/e/geometry-and-shapes/sphere/", "s": "A sphere is a set of points equidistant from a center in 3D space."}, {"n": "Spherical coordinate system", "u": "/e/geometry-and-shapes/spherical-coordinate-system/", "s": "A system using distance and two angles to locate points in space."}, {"n": "Shear mapping", "u": "/e/geometry-and-shapes/shear-mapping/", "s": "An affine transformation displacing points proportionally to signed distance."}, {"n": "Similarity (geometry)", "u": "/e/geometry-and-shapes/similarity-geometry/", "s": "Two objects are similar if they have the same shape."}, {"n": "Sierpiński triangle", "u": "/e/geometry-and-shapes/sierpi-ski-triangle/", "s": "A self-similar fractal formed by recursively removing triangles."}, {"n": "Solid angle", "u": "/e/geometry-and-shapes/solid-angle/", "s": "A measure of the field of view an object covers from a point."}, {"n": "Space (mathematics)", "u": "/e/geometry-and-shapes/space-mathematics/", "s": "A set with structure defining relationships among its elements."}, {"n": "Star polygon", "u": "/e/geometry-and-shapes/star-polygon/", "s": "Non-convex polygon with intersecting edges, often star-shaped."}, {"n": "Surface (mathematics)", "u": "/e/geometry-and-shapes/surface-mathematics/", "s": "A two-dimensional mathematical model generalizing the plane."}, {"n": "Surface area", "u": "/e/geometry-and-shapes/surface-area/", "s": "Measure of total area of a solid object's surface."}, {"n": "Surface of revolution", "u": "/e/geometry-and-shapes/surface-of-revolution/", "s": "Surface created by rotating a curve around an axis."}, {"n": "Surface (topology)", "u": "/e/geometry-and-shapes/surface-topology/", "s": "A surface is a two-dimensional topological manifold."}, {"n": "Symmetry (geometry)", "u": "/e/geometry-and-shapes/symmetry-geometry/", "s": "Symmetry is invariance under geometric transformations."}, {"n": "Tangent", "u": "/e/geometry-and-shapes/tangent/", "s": "The line that just touches a curve at a point."}, {"n": "Three-dimensional space", "u": "/e/geometry-and-shapes/three-dimensional-space/", "s": "Three coordinates define a point in space."}, {"n": "Two-dimensional space", "u": "/e/geometry-and-shapes/two-dimensional-space/", "s": "A mathematical space with two degrees of freedom."}, {"n": "Unit circle", "u": "/e/geometry-and-shapes/unit-circle/", "s": "A circle of radius 1, central to trigonometry and complex analysis."}, {"n": "Volume", "u": "/e/geometry-and-shapes/volume/", "s": "Volume quantifies three-dimensional space and container capacity."}, {"n": "Zero-dimensional space", "u": "/e/geometry-and-shapes/zero-dimensional-space/", "s": "Topological space with dimension zero under several definitions."}, {"n": "Rotation (mathematics)", "u": "/e/geometry-and-shapes/rotation-mathematics/", "s": "A geometric motion preserving at least one point."}, {"n": "Polygon", "u": "/e/geometry-and-shapes/polygon/", "s": "A plane figure of connected line segments forming a closed chain."}, {"n": "Polyhedron", "u": "/e/geometry-and-shapes/polyhedron/", "s": "Three-dimensional figures with flat faces, straight edges, and vertices."}, {"n": "Parallel (geometry)", "u": "/e/geometry-and-shapes/parallel-geometry/", "s": "Parallel lines are coplanar lines that never meet."}, {"n": "Plane (geometry)", "u": "/e/geometry-and-shapes/plane-geometry/", "s": "Two-dimensional Euclidean space with distance and angle."}]