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Height of a building

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Height of a building diagram
The height of an object is calculated by measuring the distance from the object and the angle of elevation of the top of the object. The tangent of the angle is the object height divided by the distance from the object. Thus, the height is found.
Angle of elevation
Distance to object

Object height is
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This method is often used in real-world situations. The distance to and from the object may be hamd-measured or determined from a map. Systems such as GPS or online maps services can make this particularly easy.
CalcTool's unit conversion menus make it particularly easy to input and output convenient values.