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Calculate missing angles in triangles, quadrilaterals, polygons and circles involving perpendicular bisectors and tangents as part of National 5.
Ivo G. Rosenberg, Frank Stenger, A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side, Mathematics of Computation, Vol. 29, No. 130 (Apr., 1975), pp. 390-395 ...