A1 DC2 = (their AC)2 62 – M1 DC = 7.8(35…) or 7.84 A1 ft 29.8(35…) or 29.84 or 30 with correct working A1 ft [5] M5. (a) (i) b + a or a b – – B1 (ii) b a – oe B1 (b) oe M1 = a + b a – A1 (c) = 2 or OBN a straight line or BN = OB or B is midpoint of ON B1 [5]
A1 DC2 = (their AC)2 – 62 M1 DC = 7.8(35…) or 7.84 A1 ft 29.8(35…) or 29.84 or 30 with correct working A1 ft [5] M5. (a) (i) – b + a or a – b B1 (ii) b – a oe B1 (b) oe M1 = a + b – a A1 (c) = 2 or OBN a straight line or BN = OB or B is midpoint of ON B1 [5]