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Edexcel IGCSE Math A 4.7.A informal geometrical reasons

Practise geometry-reason questions by calculating the angle value first, then writing the line, triangle or polygon fact used.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • Give a reason after calculating an unknown angle in a geometry diagram.
  • Use facts about lines, triangles, isosceles shapes or polygons to justify steps.
  • Link each numerical angle value to the line or shape property that produced it.

4.7.A Give informal reasons, where required, when arriving at question 1

[Maximum number: 1]
Diagram NOT accurately drawn

Diagram NOT accurately drawn

ABC is a straight line.

Give a reason for your answer to (i)
/

Figure for Question 4.7.A Give informal reasons, where required, when arriving at question 1 — Edexcel IGCSE Math A Foundation

Diagram NOT accurately drawn
CDE is an equilateral triangle.
ABCF is a quadrilateral.
BCE and DCF are straight lines.

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