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Extension Ladder
Using Pythagoras' theorem the length of the ladder is 20.248 feet
step ladder
10 feet, and it is at a very dangerous angle.
It is not a proportion. There needs to be aroubd a 75 degree angle from the ground to the base. If it is too flat the ladder can slip out from underneath you. If it is too steep you can tip back. There is usually an angle at the bottom of the ladder if that is flat on the ground then that should be the safest angle (75 degrees)
Extension Ladder
An extension ladder is a great tool to have. The ladder can be used in its collapsed state for shorter jobs, such as changing an outdoor lightbulb, or can be used in its extended state for higher jobs, such as cleaning out gutters.
A loft ladder is typically shorter and designed for accessing smaller spaces like an attic or loft, with a folding design that saves space when not in use. Extension ladders, on the other hand, are longer and can be extended to reach higher places like rooftops or windows, with rungs that are typically wider for more stability when climbing.
112
A forty foot extension ladder is generally the largest you can find. The top of the ladder really only hits 37 feet, and obviously, you'd be standing below that at about the 30 foot mark. That's about 3 stories. The maximum height ladder is basically the biggest ladder that is available to the home owner. Generally a 40 foot ladder is the largest available for a reasonable price. This ladder is tall enough to meet most home owners needs.
Using Pythagoras' theorem the length of the ladder is 20.248 feet
From the US OSHA Construction standards:1926.1053(b)(1)When portable ladders are used for access to an upper landing surface, the ladder side rails shall extend at least 3 feet (.9 m) above the upper landing surface to which the ladder is used to gain access; or, when such an extension is not possible because of the ladder's length, then the ladder shall be secured at its top to a rigid support that will not deflect, and a grasping device, such as a grabrail, shall be provided to assist employees in mounting and dismounting the ladder. In no case shall the extension be such that ladder deflection under a load would, by itself, cause the ladder to slip off its support.
The formula for extension (lengthening) of a material under tensile stress is given by: Extension = Original Length x Strain = Original Length x (Final Length - Original Length) / Original Length. It represents the change in length of a material when subjected to a stretching force.
step ladder
A. 11 feet B. 13 C. 12 D. 14.
You should normally have three rungs(steps) past the surface you are climbing to from the ladder. They are a foot apart on most ladders so 15 feet would be close. Add a foot since you have to angle the ladder appropriately(scope) so 16 feet or longer is safe. A 20 foot extension ladder would be a good choice.
96.6 ft