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Polygon angle theorems
This GeoGebra applet interactive allows students to explore the angle sums of polygons by finding the triangles inside the polygon.
|Teaching strategies and pedagogical approaches
|angle sum, polygons
|Strand and focus
|Angles and geometric reasoning
|AC: Mathematics (V9.0) content descriptions
Identify corresponding, alternate and co-interior relationships between angles formed when parallel lines are crossed by a transversal; use them to solve problems and explain reasons
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
Understanding geometric properties (P6)
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