CAIE IGCSE Mathematics Extended Basic Angle Reasoning

Practise finding unknown angles with sums at a point, on a straight line and inside triangles or quadrilaterals, with clear reasons.

Syllabus
2028–2030
Objective
E4.6.1
Level
Extended

Exam points

  • use 360° around a point and 180° on a straight line to form the required equation
  • apply triangle sum 180° or quadrilateral sum 360°, including equal angles in isosceles shapes
  • solve labelled algebraic angles and attach the exact geometrical reason to each step

E4.6.1 Calculate unknown angles and give simple explanations using the question 1

[Maximum number: 3]

The diagram shows three lines meeting at a point.

The ratio a: b: c=3: 4: 5.

Find the value of c.

Figure for Question E4.6.1 Calculate unknown angles and give simple explanations using the question 1 — CAIE IGCSE Mathematics Extended

NOT TO SCALE

c=
All question bank results loaded