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Victor Oxman, Two Cevians Intersecting on an Angle Bisector, Mathematics Magazine, Vol. 85, No. 3 (June 2012), pp. 213-215 ...
National 5 Applying the properties of shapes to determine an angle Perpendicular bisector Angles in a triangle add up to 180° and quadrilaterals add up to 360°. Angles can be calculated inside ...
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