# Maths KS2: Playing with polygons

**The ‘Origami Challenge’ is the game the Measures family is playing.**

The challenge is to fold a regular pentagon from an A4 piece of paper.

The timer is set for the two-minute task. 'Penta' is explained as the Greek word for 5; 'pentagon' as five angles.

A diagram and explanation give the properties of a pentagon. Images from the natural and man-made world show that there are pentagons all around us.

After two minutes, Abi Measure is the only family member to succeed in making the regular origami pentagon.

It is demonstrated how she achieved that.

Three tasks follow: we are challenged to make our own pentagon; we are asked to explore how to investigate hidden triangles within the pentagon diagram; and finally we are challenged to find the sum of the internal angles using a protractor.

This is from the series: Let's Do Maths

*Teacher Notes*

*With an emphasis on practical, kinaesthetic approaches we learn how to fold a regular pentagon, about the properties of shape in terms of number of sides and angles and how to use a protractor to measure the angles in a regular pentagon.*

*Images shown from the natural world could be used as a stimulus for further shape investigations and artwork.*

*Ask the children to have a go and then show the clip afterwards, with the answer.*

*What's the difference between an irregular and regular pentagon?*

*Using the A4 paper, what 2D shapes can they create (a range of regular and irregular shapes can be created)?*

*The children could then write instructions for how to make them, or sort their shapes in Venn or Carroll diagrams.*

*Curriculum Notes*

*This clip will be relevant for teaching Maths at KS2 in England and Wales, Early and First Level and Second Level in Scotland and KS1 and KS2 in Northern Ireland.*