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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
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.
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.
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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In this podcast episode, Medical News Today shares three actionable resolutions that can help improve brain, heart, and metabolic health in the new year via diet, sleep, and exercise.
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