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Reference.org
Solution of triangles
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<p>Solution of triangles is the main <a href="/facts/Trigonometry/K4hfaC6F">trigonometric</a> problem of finding the characteristics of a <a href="/facts/Triangle/cRXUwsMn">triangle</a> (angles and lengths of sides), when some of these are known. The triangle can be located on a <a href="/facts/Plane_(geometry)/tAUtRFcn">plane</a> or on a <a href="/facts/Sphere/jywYLNM2">sphere</a>. Applications requiring triangle solutions include <a href="/facts/Geodesy/EJH0Te0m">geodesy</a>, <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>, <a href="/facts/Construction/58eqDhy9">construction</a>, and <a href="/facts/Navigation/sGGAJ0AQ">navigation</a>. </p>