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Geometry
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Special Right Triangles
9:30
Khan Academy
Sal Khan
Special right triangles intro (part 1)
A 45-45-90 triangle is a special type of right triangle, where the ratio of the lengths of the sides of a 45-45-90 triangle is always 1:1:√2, meaning that if one leg is x units long, then the other leg is also x units long, and the hypotenuse is x√2 units long.
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