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Edexcel IGCSE Math A 4.1 angles lines and triangles

Use this angles topic to identify angle types, calculate unknown angles and justify results using line, triangle and isosceles properties.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Higher

Exam points

  • Identify acute, obtuse, reflex and right angles from diagrams or marked shapes.
  • Calculate unknown angles using straight lines, parallel lines and intersecting lines.
  • Use triangle angle sums, exterior angles and isosceles properties to find values.

Covered syllabus points

4.1.A Distinguish between acute, obtuse, reflex and right4.1.B Angle properties of intersecting lines, parallel lines4.1.C The exterior angle of a triangle property and the angle4.1.D The terms ‘isosceles’, ‘equilateral’ and ‘right-angled

4.1 Angles, lines and triangles question 1

[Maximum number: 3]
Figure for Question 4.1 Angles, lines and triangles question 1 — Edexcel IGCSE Math A Higher

Diagram NOT accurately drawn
ACE and BCD are straight lines.
AB is parallel to DE
Work out the value of x

x=

4.1 Angles, lines and triangles question 2

[Maximum number: 4]

The diagram shows a triangle.

Diagram NOT accurately drawn

Diagram NOT accurately drawn

Work out the value of x.

4.1 Angles, lines and triangles question 3

[Maximum number: 4]

The diagram shows the triangle PQR.

Diagram NOT accurately drawn

Diagram NOT accurately drawn

In the diagram, all the angles are in degrees.
R P=R Q
Find the value of y.
Show clear algebraic working.

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