ECZ 2014 · O-Level Paper 2 · Question 12 — Geometrical Transformations
Using a scale of 2 cm to represent 1 unit on each axis, draw x and y axes for -3 ≤ x ≤ 7 and -3 ≤ y ≤ 7.
(a) Triangle ABC has vertices A(3, 6), B(3, 7) and C(1, 7). Triangle A1B1C1 has vertices A1(-1, 4), B1(-2, 4) and C1(-2, 2).
(a(i)) Draw and label triangle ABC and triangle A1B1C1.[2]
Verified working — step 1
Plot triangle ABC at (3, 6), (3, 7), (1, 7) and join.(a(ii)) Describe fully a single transformation which maps triangle ABC onto triangle A1B1C1.[2]
Verified working — step 1
AB = (0, 1) maps to A1B1 = (-1, 0), a quarter turn anticlockwise.(b) The matrix 0110 maps triangle ABC onto triangle A2B2C2.
(b(i)) Find the coordinates of triangle A2B2C2.[2]
Verified working — step 1
The matrix maps (x, y) to (y, x), a reflection in the line y = x.(b(ii)) Draw and label triangle A2B2C2.[1]
Verified working — step 1
Plot A2(6, 3), B2(…(c) Triangle A1B1C1 can be mapped onto triangle A3B3C3 by a translation. Given that A3 is the point (3, -1),
(c(i)) find the column vector representing this translation,[1]
Verified working — step 1
Take a pair of corresponding vertices: A1(-1, 4) maps to A3(3, -1).(c(ii)) draw and label triangle A3B3C3.[1]
Verified working — step 1
Add 4-5 to each vertex of A1B1C1.(d) Triangle A4B4C4 has vertices A4(0, 3), B4(0, 1) and C4(4, 1).
(d(i)) Draw and label triangle A4B4C4.[1]
Verified working — step 1
Plot A4(0, 3), B4(…(d(ii)) Describe fully the transformation which maps triangle ABC onto triangle A4B4C4.[2]
Verified working — step 1
AB = (0, 1) maps to A4B4 = (0, -2), so the scale factor is -2.The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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