levations above datum are hA=1760ft and hB=1425ft Images a and b on a vertical photograph have photo coordinates xa=2.95in., ya=2.32in., xb=−1.64in., and yb=−2.66in. The camera focal length was 152.4mm and the flying height above datum 7700ft. An image c of a third point C appears. Its elevation hC=1455ft and its photo coordinates are xc=3.20in. and yc=−2.66in Using EXCEL Calculate Angle A Calculate Angle B Calculate Angle

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Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.