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The safest angle for a ladder is 75.5°; if it is too shallow, the bottom of the ladder is at risk of sliding, and if it is too steep, the ladder may fall backwards. This angle is achieved by following the 4 to 1 rule for a ladder placed on a vertical wall: for every four feet of vertical height, the ladder foot should move one foot from the wall.
The ladder itself is capable of being converted into several heights and configurations from a single ladder. Configurations include a straight or extension ladder, an A-frame ladder, a staircase ladder (an uneven A-frame for use on stairs), a 90° ladder, and both sides of a scaffolding trestle achieved through a triple locking hinge.
An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.
Folding a rectangular sheet of paper into thirds using the crossed ladders problem. The optic equation of the crossed ladders problem can be applied to folding rectangular paper into three equal parts: 1 / 1/2 + 1 / 1 = 1 / h ∴ 2 + 1 = 1 / h ∴ h = 1 / 2 + 1 = 1 / 3
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The claim: Tim Walz said he wanted to invest in a ladder factory to help migrants get over border wall. An Aug. 6 Instagram post (direct link, archive link) includes a video of Minnesota Gov. Tim ...
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