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Related topic
Mathematics / Year 7 / Measurement
Curriculum content descriptions
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 (AC9M7M05)
Elaborations
- using 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 \(180\)°
- using decomposition and the angle sum of a triangle to generalise the interior angle sum of an \(n\)-sided polygon, as \(180(n-2)\;=\;180n-360\)
General capabilities
ScOT terms
Interior angles, Polygons