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AC9M7M05

demonstrate that the interior angle sum of a triangle in the plane is 180° and apply this to determine the interior angle sum of other shapes and the size of unknown angles

Elaborations

  • AC9M7M05_E1using concrete materials to demonstrate that the sum of the interior angles of a triangle is 180°; for example, using paper triangles and tearing to demonstrate that the interior angles when combined form 180°
  • AC9M7M05_E2using decomposition and the angle sum of a triangle to generalise the interior angle sum of an n-sided polygon, as 180(n-2) = 180n-360

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AC9M7M05 – demonstrate that the interior angle sum of a triangle in the plane is 180° and apply this to determine the interior angle sum of other shapes and the size of unknown angles | LessonForge