📐 3-4-5 METHOD: SETTING OUT A 90° ANGLE
The 3-4-5 method is a simple construction technique used to establish accurate right angles (90°) on-site without advanced surveying equipment.
🔹 How It Works: Based on the Pythagorean theorem: 3² + 4² = 5²
🔹 Site Procedure:
Mark the reference corner.
Measure 3 units along one direction.
Measure 4 units along the other direction.
Check the diagonal; it must measure 5 units.
📏 Common Measurements:
3–4–5 m
6–8–10 m
9–12–15 m
🏗️ Applications:
✔️ Building setting-out
✔️ Foundation layout
✔️ Column and wall positioning
✔️ Checking rectangular layouts
💡 Site Tip: Use larger multiples for better practical accuracy on larger construction layouts.
@etconp
The 3-4-5 method is a simple construction technique used to establish accurate right angles (90°) on-site without advanced surveying equipment.
🔹 How It Works: Based on the Pythagorean theorem: 3² + 4² = 5²
🔹 Site Procedure:
Mark the reference corner.
Measure 3 units along one direction.
Measure 4 units along the other direction.
Check the diagonal; it must measure 5 units.
📏 Common Measurements:
3–4–5 m
6–8–10 m
9–12–15 m
🏗️ Applications:
✔️ Building setting-out
✔️ Foundation layout
✔️ Column and wall positioning
✔️ Checking rectangular layouts
💡 Site Tip: Use larger multiples for better practical accuracy on larger construction layouts.
@etconp
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