Make the 4-to-1 rule automatic

The 4-to-1 rule converts working ladder length into base distance before anyone climbs. Extension ladder angle: ratio first, climb second Working length Distance along the ladder to the top support 4 parts Base distance Horizontal distance from wall to feet 1 part Too steep Feet too close; top transition becomes unstable tip risk Too shallow Feet too far; rails and feet are poorly loaded slide risk Still check Footing, top support, securing, access extension required Target base distance is one quarter of working length

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