41 Using the sine rule: 2 H = sin B = 35 × To maximise the angle we need to M2 M2 showing how the sine rule is applied in this situation maximise this calculation by using the upper bound of sin 61° and 35 cm and the lower bound of 42 cm: B1 B1 for setting the equation with sinB as subject sin B = 35.5 × sin B = 0.751 759 2 C1 C1 for clear explanation of how we maximise the B = sin-1 0.751 759 2 calculation B = 48.742 997° B1 B1 for calculation used with correct bounds B1 B1 for correct value not rounded B1 B1 for correct answer to 2 or 3 sf B = 48.7 (3sf) 7
41 Using the sine rule: = sin B = 35 × To maximise the angle we need to maximise this calculation by using the upper bound of sin 61° and 35 cm and the lower bound of 42 cm: sin B = 35.5 × sin B = 0.751 759 2 B = sin-1 0.751 759 2 B = 48.742 997° B = 48.7 (3sf) M2 B1 C1 B1 B1 B1 2 M2 showing how the sine rule is applied in this situation B1 for setting the equation with sinB as subject C1 for clear explanation of how we maximise the calculation B1 for calculation used with correct bounds B1 for correct value not rounded B1 for correct answer to 2 or 3 sf H 7
Higher_Skills_Number_MarkScheme_Edexcel.docx