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Khan Academy
45-45-90 triangles | Right triangles and trigonometry | Geometry | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/geometry-home/right-triangles-topic/special-right-triangles/v/45-45-90-triangles Introduction to 45-45-90 Triangles Watch the next lesson: https://www.khanacademy.org/math/geometry/right_triangles_topic/special_right ...
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