Geometrical properties: polygons
Why this, why now
In this unit pupils will investigate internal and external angles of polygons and angles made with a transveral and parallel lines. Pupils will develop their ability to formally prove properties of polygons to generalise.
Prior knowledge requirements
- Ardaydu waa inay yaqaanaan aasaaska maadada.
- Ardaydu waa inay awoodaan inay raacaan tilmaamo fudud.
Unit 9 / 10
Geometrical properties: polygons
In this unit pupils will investigate internal and external angles of polygons and angles made with a transveral and parallel lines. Pupils will develop their ability to formally prove properties of polygons to generalise.
16 lessons- Interior and exterior angles of regular polygons
- Securing understanding of angles from KS2
- Interior angles of a polygon
- Corresponding angles
- Co-interior angles
- The sum of the interior angles of any triangle
- Formal angle notation
- Missing angles
- Deriving the sum of interior angles in multiple ways
- Alternate angles
- Checking understanding of angles from KS2
- Problem solving with polygons
- Angles on parallel lines traversed by a straight line
- Formalising understanding of triangles from KS2
- Exterior angles of polygons
- Using the sum of the interior angles of a triangle