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4MA1/1FR Jun 2024, Question 6: Lines of Symmetry

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1FR (Foundation) · Calculator · 4 marks

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The question, in short

Questions on a regular octagon's symmetry and on a shape: identify a right angle and an obtuse angle, and measure angle x in degrees.

Summarised in our own words. Use the official paper for the exact wording and the diagram.

Part (a) · 1 mark

State how many lines of symmetry a regular octagon has.

  1. 1A regular octagon has 8 lines of symmetry, one through each pair of opposite vertices and one through the midpoint of each pair of opposite sides.

Answer8

Part (b) · 1 mark

Mark a right angle on the shape using the letter R.

  1. 1Identify the angle at the bottom left vertex as a right angle.
  2. 2Mark this angle with the letter R.

AnswerR marked at bottom left vertex

Part (c) · 1 mark

Mark an obtuse angle on the shape using the letter O.

  1. 1Identify the angle at the bottom right vertex as an obtuse angle.
  2. 2Mark this angle with the letter O.

AnswerO marked at bottom right vertex

Part (d) · 1 mark

Measure the angle marked x and give its size in degrees.

  1. 1Use a protractor to measure the angle marked x.
  2. 2Read the measurement: the angle is 42 degrees.

Answer42 (accept 40 to 44)

Stuck on a step? Read the free lesson: Lines of Symmetry

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