ShadowsThe sun's elevation θ gives a shadow of length tanθh: a lower sun throws a longer shadowLocked
Two triangles0 / 3
Two points of observationTwo angles of the same top from two points on a line give two triangles sharing the height: solve for the height and the distances togetherLocked
Towers, flagstaffs and buildingsA flagstaff on a tower, or a hill seen from the top and the foot of a building: the two angles share one horizontal distanceLocked
Directions and reflectionsPoints due south and due east of a tower meet at right angles on the ground; a reflection in a lake lies as far below the surface as the object is aboveLocked