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How to Check 90° Corner Using the 3-4-5 Triangle Rule. What is the 3–4–5 method? It comes from the Pythagorean theorem: 3^2 4^2 = 5^2 So any triangle with sides 3 units, 4 units, and 5 units will always have a perfect 90° angle. ⭐ 2. How it is used at site? At the building corner, workers measure: One side = 4.00 m Other side = 3.00 m Diagonal = 5.00 m If the diagonal equals exactly 5 m, the angle is correctly 90°. The top of the image shows this clearly: Left wall = 4.00 m Right wall = 3.00 m D
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