Geometry 

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Geometry

The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs.

Geometry will guide you through points, lines, planes, angles, parallel lines, triangles, similarity, trigonometry, quadrilaterals, transformations, circles and area. – mathplanet.com

"There is no royal road to Geometry." – Euclid, Father of Modern Geometry