Quadrilaterals — Squares & Rectangles
Section: GeometryBank code: GEO-QDLGRE frequency: HighPro
1. Core Idea
A quadrilateral is any four-sided figure; its interior angles always sum to 360 degrees.
The GRE's favourites are the rectangle and the square, and the recurring theme is the diagonal, which turns every rectangle problem into a Pythagoras problem and every square problem into a 45-45-90 problem.
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