43 C1 2 C1 for clear use of diagram M Use the cosine rule. = + - 2ab cos C c2 a2 b2 = 9 + 16 2 × 3 × 4 × cos 60° – = 25 24 × – = 13 = c M1 M1 for correct cosine rule statement A1 A1 for correct substitution B1 B1 for cos 60° = M1 for taking square root M1 A1 for correct surd form cm A1 6 44 B1 2 B1 for correct diagram M B1 B1 for correct vector 2 45 B1 2 B1 for No M No. To work out the return vector, multiply each component by –1. The return vector is . B1 B1 for correct vector C1 C1 for a clear explanation of what Joel should have done 3
43 Use the cosine rule. c2 = a2 + b2 - 2ab cos C = 9 + 16 – 2 × 3 × 4 × cos 60° = 25 – 24 × = 13 c = cm C1 M1 A1 B1 M1 A1 2 C1 for clear use of diagram M1 for correct cosine rule statement A1 for correct substitution B1 for cos 60° = M1 for taking square root A1 for correct surd form M 6 44 B1 B1 2 B1 for correct diagram B1 for correct vector M 2 45 No. To work out the return vector, multiply each component by –1. The return vector is . B1 B1 C1 2 B1 for No B1 for correct vector C1 for a clear explanation of what Joel should have done M 3
Higher_Skills_Geometry_MarkScheme_Edexcel.docx