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DigiTransact Mastermind
Maths•JHS Mensuration & Geometry

Angles & triangles

Junior High 6 questions
AI-drafted from platform data — specialist review scheduledBy DigiTransact Mastermind editorial teamLast updated
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What angles & triangles means

You use angle facts to work out missing angles in lines, around a point and inside triangles. This helps you solve geometry questions quickly and check whether your answer is reasonable.

What you will practise

  • Find missing angles on a straight line
  • Use angles around a point to total 360°
  • Calculate the third angle in a triangle
  • Work out simple angle problems from diagrams

Before you start

You should be comfortable with recognising acute, right, obtuse and straight angles. You also need to know basic subtraction and addition facts.

Not confident yet? Work through Perimeter & area first.

Worked example

One question from this skill's own question bank, shown with its full working.

Question

The angles in a triangle add up to how many degrees?

  • 90°
  • 180°
  • 270°
  • 360°
Answer: 180°

Working: The interior angles of any triangle sum to 180°.

Common mistakes to avoid

  • Using 90° for every triangle instead of 180° for all interior angles.
  • Adding the given angles when you should subtract them from the total.
  • Forgetting that angles on a straight line make 180°.
  • Mixing up angles around a point with angles inside a triangle.

Curriculum and exam alignment

Ghana GES Basic 7 to 9 syllabusBECE

This topic normally appears in Junior High School geometry work in Basic 7 to Basic 9. It also supports the type of angle questions that can appear in BECE preparation.

Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.

Related skills

Other JHS Mensuration & Geometry skills in Maths, at the same point in the course.

Other Maths topics

Picture Addition & SubtractionEarly NumeracyNumber BasicsSHS Core MathematicsUniversity MathematicsAlgebra

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Exams that assess angles & triangles

Junior High work on this skill feeds directly into these exam papers. Each page lists the Maths topics that appear on it.

BECEBECE practice questionsFree BECE practice across the subjects at this stage, with worked answers.GESGES practice questionsFree GES practice across the subjects at this stage, with worked answers.WASSCEWASSCE practice questionsListed as a related subject on the WASSCE practice page.

How this page was produced

This text was drafted with AI assistance from the questions and topics already stored on the platform. A subject-specialist review is scheduled but has not yet been recorded, so we do not claim it here.

Written by
DigiTransact Mastermind editorial team
Human review
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Last updated

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Practise angles & triangles

6 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.

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