Geometric transformations (translation) — KCSE Mathematics

KCSE Mathematics · 110 practice questions · 3 syllabus objectives

36 easy37 medium37 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe a translation using a column vector; find the image of a point or shape under a given translation

Find the translation vector that maps one point or shape to another; combine two successive translations

Geometric transformations (translation)

Sample Questions

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1
easySHORT ANSWER4 marks

A point A(3, 4) is translated by the vector (2, -1). (a) State the coordinates of the image A' after the translation. (2 marks) (b) If point B(1, 2) undergoes the same translation, find the coordinates of the image B'. (2 marks)

View Marking Scheme
Part (a) — 2 marks
A' = (3 + 2, 4 - 1) = (5, 3) (2 mks)
Part (b) — 2 marks
B' = (1 + 2, 2 - 1) = (3, 1) (2 mks)
2
easySHORT ANSWER3 marks

Triangle DEF has vertices D(2, 3), E(4, 5), and F(6, 7). State the coordinates of the image D'E'F' after a translation by the vector (3, -2). (3 marks)

View Marking Scheme
Part (a) — 3 marks
D' = (2 + 3, 3 - 2) = (5, 1) (1 mk)
E' = (4 + 3, 5 - 2) = (7, 3) (1 mk)
F' = (6 + 3, 7 - 2) = (9, 5) (1 mk)
3
easySHORT ANSWER3 marks

Triangle PQR has vertices P(30, 88), Q(34, 50) and R(22, 82). (a) Find the image P'Q'R' under translation by vector (23, 34). [2 marks] (b) Find the translation vector that maps P to P' where P'= (54, 89). [1 mark]

View Marking Scheme
Part (a) — 3 marks
Each vertex correctly translated by adding (tx, ty) (1 mk)
Image vertices P'Q'R' all correct (1 mk)
Translation vector = P' − P = (ppx−px, ppy−py) correct (1 mk)
4

Triangle PQR has vertices P(23, 26), Q(73, 49) and R(22, 11). (a) Find the image P'Q'R' under translation by vector (49, 99). [2 marks] (b) Find the translation vector that maps P to P' where P'= (50, 20). [1 mark]

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