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O-LevelMathematicsVectors and transformations4024/21 · May/June 2015 · Q1112 Marks

(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.

  1. (a)(i)Find FH .[1]
  2. (a)(ii)Using vectors, show that GD is parallel to FH.[2]
  3. (a)(iii)(a)It is given that c = (4/5)a + (1/5)b. Express DC in terms of a and b.[2]
  4. (a)(iii)(b)Find |AF| : |DC|.[1]
  5. (b)[Figure for transformation] The transformation T maps triangle ABC onto triangle A'B'C'.
  6. (b)(i)(a)Describe fully the transformation T.[2]
  7. (b)(i)(b)The matrix M represents the transformation T. Find the matrix M.[2]
  8. (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]
  9. (b)(iii)Triangle ABC is mapped onto triangle A"B"C" by an anticlockwise rotation about the origin. State the angle of rotation.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

  1. [1] b
  2. [2] 2b correctly obtained; M1 for GB+ BA+ AE + ED soi
  3. [2] (8/5)a - (8/5)b; B1 for DC= 2c - 2b
  4. [1] 1: (8/5) oe
  5. [2] Reflection in y = x; B1 for reflection
  6. [2] ((0 1), (1 0)); M1 for either column
  7. [1] Vertices (-3, 6) (-3, 0) (0,-2)
  8. [1] 90

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About this question

Topic
Vectors and transformations, O-Level Mathematics (syllabus 4024). Structured question, 12 marks.
Source
O-Level Mathematics, May/June 2015 Paper 2 Variant 1, question 11.

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