Geometry is a branch of mathematics that studies the properties, measurements, and relationships of points, lines, angles, surfaces, and solids.The word comes from the Greek words geo (earth) and metron (measurement), meaning "earth measurement.Core ConceptsPoints, lines, and planes: The basic building blocks. A point has no size, a line extends infinitely in one dimension, and a plane is a flat surface extending in two dimensions.Two-dimensional (2D) geometry: Flat shapes like triangles, squares, and circles that have area but no volume.Three-dimensional (3D) geometry: Solid objects like cubes, cylinders, and spheres that have volume and depth.Main BranchesEuclidean geometry: The traditional study of flat spaces and rigid shapes based on the rules of the ancient Greek mathematician Euclid.Non-Euclidean geometry: Advanced systems like hyperbolic and elliptical geometry that deal with curved spaces.

Geometry is a branch of mathematics that studies the properties, measurements, and relationships of points, lines, angles, surfaces, and solids.The word comes from the Greek words geo (earth) and metron (measurement), meaning "earth measurement.Core ConceptsPoints, lines, and planes: The basic building blocks. A point has no size, a line extends infinitely in one dimension, and a plane is a flat surface extending in two dimensions.Two-dimensional (2D) geometry: Flat shapes like triangles, squares, and circles that have area but no volume.Three-dimensional (3D) geometry: Solid objects like cubes, cylinders, and spheres that have volume and depth.Main BranchesEuclidean geometry: The traditional study of flat spaces and rigid shapes based on the rules of the ancient Greek mathematician Euclid.Non-Euclidean geometry: Advanced systems like hyperbolic and elliptical geometry that deal with curved spaces.