4024/12 Oct/Nov 2021, Question 3: Rotational Symmetry
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 1 mark
اقرأ هذا الحل مشروحاً بالعربي ←
The question, in short
A large equilateral triangle is split into 16 small triangles, five already shaded; shade one more small triangle so the whole shape has rotational symmetry of order 3.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 1 mark
- 1For order 3 the shading must repeat under 120° turns about the centre
- 2Shade row 3, triangle 1 (the left-most small triangle in the third row)
AnswerShade row 3, triangle 1 (the left-most small triangle in the third row)
Stuck on a step? Read the free lesson: Rotational Symmetry
Practise more rotational symmetry questions
Real 4024 past-paper questions, marked on your working like the exam, with a worked solution for every part.
Practise free on LemmaraMore past-paper questions on rotational symmetry
Also searched as: 4024/12/O/N/21 · 4024_w21_qp_12 · 4024 w21 12 · question 3.
Lemmara is an independent study tool, not affiliated with or endorsed by Cambridge International Education. The worked solutions are Lemmara’s own.