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Home > Topdrawer > Geometric reasoning > Big ideas > Geometric proof > Year 7: Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral.

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Year 7: Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral.

Year 7: Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral.

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