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.

Have a different question?

Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.

Search any past-paper question

More Geometrical Transformations questions from past papers