A1 (c) Straight line because OD = + a b B1 3 times bigger because OF = 3a + 3b B1 [7] M47. 2.75 × 27 M1 for 33 M1 74.25..... Accept 74 or 74.3 Height first pyramid is 2.0625 Height second is 6.1875 Volume is × 62 × 6.1875 = 74.25 This line M1, A1. A1 [2] M48. Angle ATB = 13° B1 M1 for use of sine rule, A1 for correct substitution.
A1 (c) Straight line because OD = a + b B1 3 times bigger because OF = 3a + 3b B1 [7] M47. 2.75 × 27 M1 for 33 M1 74.25..... Accept 74 or 74.3 Height first pyramid is 2.0625 Height second is 6.1875 Volume is × 62 × 6.1875 = 74.25 This line M1, A1. A1 [2] M48. Angle ATB = 13° B1 M1 for use of sine rule, A1 for correct substitution.
AllUnit3QnsandmarkschemeWordversion.docx