Classifying Angles — Interactive Lesson (Year 5)

Is an angle of 200° obtuse or reflex? This 20-slide interactive lesson teaches classifying angles as acute, obtuse or reflex, building on knowledge of right angles.

Mastering Classifying Angles in Year 5 Maths

Pupils classify angles using their knowledge of right angles, progress from classifying angles as acute or obtuse to include reflex angles, and classify angles by sight within geometric figures. They learn that angles less than 90° are acute, angles between 90° and 180° are obtuse, and angles between 180° and 360° are reflex, then apply this to labelled points within a shape, deciding whether each marked angle is acute, obtuse or reflex.

What’s Included

• 20-slide interactive lesson on classifying angles
• Learning objectives building from right angles to reflex angles
• Clear definitions and examples of acute, obtuse and reflex angles
• Classifying multiple labelled angles within one shape
• Sentence-completion and multiple-choice questions with instant feedback

Key Benefits for Students

• Builds a clear, memorable set of angle definitions
• Progresses logically from right angles to reflex angles
• Practises classifying several angles within one diagram
• Instant feedback on answer questions

Why Teachers Love It

• No prep — ready for whole-class teaching on an interactive whiteboard
• A structured lesson that can be split across sessions
• Self-marking questions support independent practice
• Suits teaching, revision and homework
• A dependable foundation before measuring angles with a protractor

Love this? You’ll love…

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A dependable addition to a Year 5 geometry topic, giving pupils clear definitions and plenty of practice classifying angles by sight. This vocabulary is essential before pupils move on to measuring and calculating angles.

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FAQs

What year group is this for?
Year 5 (ages 9–10), KS2.

Does it cover reflex angles?
Yes — alongside acute and obtuse angles.

Is it self-marking?
Yes, with instant feedback on the questions.