A 45 45 90 triangle is a special type of isosceles right triangle where the two legs are congruent to one another and the non-right angles are both equal to 45 degrees. Many times, we can use the Pythagorean theorem to find the missing legs or hypotenuse of 45 45 90 triangles.
45-45-90 Triangles - Concept - Geometry Video by Brightstorm
https://www.brightstorm.com/math/geometry/pythagorean-theorem/45-45-90-triangles/
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Identifying the 45 – 45 – 90 Degree Triangle - dummies
www.dummies.com/education/math/.../identifying-the-45-45-90-degree-triangle/
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