(a) ABCDE is a pentagon. AFB, AHE and BGC are straight lines. F is the midpoint of AB. H is the midpoint of AE. G divides BC in the ratio 1: 2. AH = a, AF = a − b, BG = ED = c.
- (a)(i)Find FH .[1]
- (a)(ii)Using vectors, show that GD is parallel to FH.[2]
- (a)(iii)(a)It is given that c = (4/5)a + (1/5)b. Express DC in terms of a and b.[2]
- (a)(iii)(b)Find |AF| : |DC|.[1]
- (b)[Figure for transformation] The transformation T maps triangle ABC onto triangle A'B'C'.
- (b)(i)(a)Describe fully the transformation T.[2]
- (b)(i)(b)The matrix M represents the transformation T. Find the matrix M.[2]
- (b)(ii)Triangle A'B'C' is mapped onto triangle A"B"C" by a reflection in the y-axis. Draw and label triangle A"B"С".[1]
- (b)(iii)Triangle ABC is mapped onto triangle A"B"C" by an anticlockwise rotation about the origin. State the angle of rotation.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.
- [1] b
- [2] 2b correctly obtained; M1 for GB+ BA+ AE + ED soi
- [2] (8/5)a - (8/5)b; B1 for DC= 2c - 2b
- [1] 1: (8/5) oe
- [2] Reflection in y = x; B1 for reflection
- [2] ((0 1), (1 0)); M1 for either column
- [1] Vertices (-3, 6) (-3, 0) (0,-2)
- [1] 90
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