# 64. Through the square window

Did you get the ‘Through the square window’ reference? Hmmm… for those too young to remember the BBC programme ‘Playschool’ here is a picture:

This activity is all about regular polygons. It would be best for primary pupils or lower ability KS3.

Equipment
Clear lids from big yoghurt pots.
Sharpie markers or similar
Post-it notes
Pencil, ruler, protractor, compasses

Prep

On the reverse of a post-it note, draw a regular polygon.

Stick the post-it on the underside of the lid.

Trace the shape onto the plastic lid.

Label it.

You have just made a shape viewer!

Activity
Give pupils shape viewers and challenge them to find as many ‘real life’ examples of each shape as they can in the classroom or playground.

As the lids are clear, pupils can look through them to find the shapes.

Note
You could make a rectangle viewer and challenge pupils to explain why it isn’t regular.

# 39. So simple a child could do it

Forget making hearts with your hands – that’s so 2012! Triangles and quadrilaterals are the way to go.

This is quicker than getting whiteboards out, can be used as a memory aid and keeps mischievious fingers busy.

Getting started
The basic L shapes (my assistant had been busy with felt tip pens before being photographed).

Isosceles Triangle

Index figures and thumbs together.

Equilateral Triangle

Index figures together, thumbs overlapping.

Rectangle

Index fingers and thumbs joined at 90 degrees.

Parallelogram

As for the rectangle, but opposite angles equal (as opposed to 90 degrees).

Square

Thumbs part way down index fingers at 90 degrees.

Rhombus

As for the square, but opposite angles equal (rather than 90 degrees).

Index fingers together, thumbs together, all pointing upwards.

Kite

Index fingers pointing up, thumbs pointing down.