An angle of ______ gives adequate stability, insures safe stress on ladder and is easy to climb.

An angle of 75 degrees is considered optimal for ladder placement because it strikes a balance between stability and ease of use. This angle allows the ladder to make effective use of its structural integrity, providing adequate support while preventing excessive stress on the ladder's components. A ladder positioned at a 75-degree angle is stable enough to bear the weight of the firefighter while also allowing for a comfortable and safe climbing experience.

Additionally, this angle facilitates easy access to the point of entry, whether it be a window or roof, without sacrificing safety. It reduces the likelihood of slipping and enhances the control the firefighter has while ascending or descending. In contrast, angles that are significantly more acute or steep can lead to less stability and more challenge in terms of climbing, potentially increasing the risk of accidents.