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## Triangle Inequality Rule

One of the less-common but still need-to-know rules tested on the GMAT is the “triangle inequality” rule, which allows you to draw conclusions about the length of the third side of a triangle given information about the lengths of the other two sides. Often times,...

## The 5-12-13 and 7-24-25 Right Triangles

By: Rich Zwelling, Apex GMAT Instructor Date: 12th January, 2021 The 5-12-13 and 7-24-25 Right Triangles Although the 3-4-5 right triangle is by far the most common of the so-called “Pythagorean triples” tested on the GMAT, there are a few others worth knowing. First,...

## 45-45-90 Right Triangle – GMAT Geometry Guide

By: Rich Zwelling, Apex GMAT Instructor Date: 6th January, 2021 45-45-90 Right Triangle Another of the commonly tested triangles on the GMAT is the 45-45-90, also known as the isosceles right triangle. Know that term, as it could appear by name in a question. As shown...

## The 3-4-5 Right Triangle – GMAT Geometry Guide

By: Rich Zwelling, Apex GMAT Instructor Date: 17th December, 2020 Right Triangle Identities: 3-4-5 Right triangles always adhere to the same basic relationship, reflected by the Pythagorean Theorem, or a² + b² = c², where a, b, and c match the triangle sides as...

## A short meditation on GMAT triangles – Read this if you struggle with triangle problems on the GMAT!

GMAT Triangles Close your eyes, imagine a triangle, then open your eyes again. Which of the following did you picture? Something different? Well, every one of the above is tested on the GMAT. And you can’t stick to just one conception of a single shape. You have to be...