Right-Angled

A right-angled triangle is any triangle having one right angle. The side opposite the right angle is called the hypotenuse. A right-angled riangle may be isosceles or scalene.

Right Angled Triangle (Definition, Properties, Formulas)

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Right Angle Triangle - GCSE Maths Steps, Examples & Worksheet

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File:Black right angled triangle 4.png - Wikipedia