46 a C3 2 C1 for showing construction of 60° H C1 for showing bisection of 60° C1 for showing bisection of 30° to show 15° b C1 for showing construction of 90° C3 C1 for showing construction of 60° to leave a 30° angle C1 for bisecting that 30° angle to leave 75° 6 C2 2 M1 for explanation referring to the bisector being H 47 Each angle bisector is the locus of equidistant points equidistant from the two arms or sides of the angle. Hence, where they all meet will be M1 for the interpretation of the intersections the only point that is equidistant from each of the three sides. Hence a circle can be drawn inside the triangle, with this centre, that just touches each side of the triangle. P1 P1 for the use of a diagram to help interpret the explanation 3
46 a b C3 C3 2 C1 for showing construction of 60° C1 for showing bisection of 60° C1 for showing bisection of 30° to show 15° C1 for showing construction of 90° C1 for showing construction of 60° to leave a 30° angle C1 for bisecting that 30° angle to leave 75° H 6 47 Each angle bisector is the locus of points equidistant from the two arms or sides of the angle. Hence, where they all meet will be the only point that is equidistant from each of the three sides. Hence a circle can be drawn inside the triangle, with this centre, that just touches each side of the triangle. C2 P1 2 M1 for explanation referring to the bisector being equidistant M1 for the interpretation of the intersections P1 for the use of a diagram to help interpret the explanation H 3
Higher_Skills_Geometry_MarkScheme_Edexcel.docx