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You use angle facts to find missing values in lines, triangles and polygons. This helps you check diagrams quickly and solve exam questions with confidence.
You should already know how to read simple angle diagrams and use subtraction confidently. It also helps if you can recognise sides, vertices and common shapes.
One question from this skill's own question bank, shown with its full working.
Two angles on a straight line measure x° and 65°. Find x.
Working: Angles on a straight line sum to 180°: x = 180 − 65 = 115.
This topic normally appears in Junior High School Geometry and Measurement work, where you learn to use angle facts in plan shapes. It supports BECE-style questions that ask you to find missing angles and use polygon rules correctly.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Other JHS Geometry & Measurement skills in Maths, at the same point in the course.
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6 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.