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O-LevelMathematicsGeometry4024/11 · Oct/Nov 2023 · Q104 Marks

Four exterior angles of a pentagon are 150°, 100°, 45° and 35°. Calculate the size of the remaining exterior angle.

  1. (a)Four exterior angles of a pentagon are 150°, 100°, 45° and 35°. Calculate the size of the remaining exterior angle.[2]
  2. (b)Calculate the interior angle of a regular decagon.[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

  1. [2] (a) 30
  2. [2] M1 for 360 – (150+100+45+35) oe
  3. [2] (b) 144
  4. [2] M1 for 180×(10-2)/[10] oe or for [180 -] 360/10 oe

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About this question

Topic
Geometry, O-Level Mathematics (syllabus 4024). Structured question, 4 marks.
Source
O-Level Mathematics, Oct/Nov 2023 Paper 1 Variant 1, question 10.

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