Year 8 · Maths
Derive and use angle sums to make deductions in Year 8 Maths
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Focus on sum of interior and exterior angles of polygons. Open support for “Calculate Missing Angles in Quadrilaterals”, then explain the idea in your own words.
Year 8 learners practise sum of interior and exterior angles of polygons.
The activities include Calculate Missing Angles in Quadrilaterals, Calculate the Exterior Angles of Regular Polygons, Find Angles in Quadrilaterals, and related practice. The checked support below includes teach, worksheet, video, teaching. Open a resource in its provider's website and choose the format that best helps the learner explain the idea independently.
Activities covered
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- Calculate Missing Angles in Quadrilaterals — support from Oak National Academy
- Calculate the Exterior Angles of Regular Polygons — support from Oak National Academy
- Find Angles in Quadrilaterals — support from Oak National Academy
- Find the Size of an Interior Angle in Regular Polygons — support from Oak National Academy
- Find the Sum of Interior Angles — support from Oak National Academy
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Watch it explained
watch a video explanation
Oak video: Interior Angles Of A Polygon
Best for: a clear explanation before you practise
Oak video: Exterior Angles Of Polygons
Best for: a clear explanation before you practise
Oak video: Interior And Exterior Angles Of Regular Polygons
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Oak video: Deriving The Sum Of Interior Angles In Multiple Ways
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Learn it properly
lessons and teaching pages
Oak lesson slides: Interior Angles Of A Polygon
Best for: worked examples and step-by-step teaching
Angles in Triangles and Quadrilaterals
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Oak lesson slides: Exterior Angles Of Polygons
Best for: worked examples and step-by-step teaching
Angles in Polygons
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Geometrical properties: polygons
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Oak lesson slides: Interior And Exterior Angles Of Regular Polygons
Best for: worked examples and step-by-step teaching
Oak lesson slides: Deriving The Sum Of Interior Angles In Multiple Ways
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Polygons: Sum of Interior Angles
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Practise it
questions and activities to try
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Print and finish
worksheets away from the screen
Oak worksheet: Interior Angles Of A Polygon
Best for: pencil-and-paper practice away from the screen
Oak worksheet: Exterior Angles Of Polygons
Best for: pencil-and-paper practice away from the screen
Missing Angles Practice Questions
Best for: pencil-and-paper practice away from the screen
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