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GRE quantitative section is comprised almost entirely of concepts taught in high school mathematics. ETS divides these concepts into four broad content areas, namely arithmetic, algebra, geometry and data analysis. This is the third part of a comprehensive guide covering these four areas:

# III. GEOMETRY

**Parallel & Perpendicular Lines:**Lines that will never meet (parallel lines) and lines that are at ninety degrees to each other (perpendicular lines) have important properties.**Circles:**Circles are geometric figures comprising points equidistant from a central point. This symmetry results in intuitive mathematical properties, which are tested by the GRE.**Triangles:**The simplest of all polygons, triangles on the GRE include right-angled, isosceles, equilateral, right-isosceles and 30°-60°-90° triangles.**Quadrilaterals:**All quadrilaterals, including squares, rhombuses, rectangles, parallelograms and trapeziums are part of the GRE quant.**Other Polygons:**Pentagons, hexagons and so on, all the way up to the 10-sided decagon should be remembered along with some general properties.**3-D Figures:**Solids, as 3-D figures are called, are also part of the GRE quant. Three solid shapes are tested namely rectangular solids, cubes and circular cylinders.**Area, Perimeter & Volume:**These basic attributes of planar and spatial geometric figures should be understood by all prospective test takers.**Pythagorean Theorem:**A very useful albeit simple result that holds for every right-angled triangle.

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