## Level 1: Parabola

Click a dot to select it. Click on a second dot to draw a line between the two dots.

Join each dot in the vertical line with a dot in the horizontal line so that their numbers add to 13.

This activity is about creating what appear to be curves from straight lines.

A search in Wikipedia for 'Curve Stitching' redirects to a page on 'String Art', otherwise known as 'Pin and Thread Art', characterized by an arrangement of coloured thread strung between points to form geometric patterns.

I remember doing curve stitching at my Primary school. First we would punch small holes in patterns in card then we would join up the holed with coloured wool to make similar patterns to those in this online activity. Our finished designs could be used as greeting cards, calendar images or framed pictures for relatives and friends.

Wikipedia goes on to say that String art has its origins in the 'curve stitch' activities invented by Mary Everest Boole at the end of the 19th century to make mathematical ideas more accessible to children. It was popularised as a decorative craft in the late 1960s through kits and books.

There is a printable set of printable templates to go with this activity.

Mathematical Bridge Cambridge [Photo credit: John Tranter] Although it appears to be an arch, it is composed entirely of straight timbers.

#### How Many Squares? 2

A printable grid containing many copies of the design used in the second shape counting Starter.

www.transum.org/go/?to=manysquares2

#### Areas of Composite Shapes

Find the areas of combined (composite) shapes made up of one or more simple polygons and circles.

www.transum.org/go/?to=areacomposite

#### Areas Investigation

Investigate polygons with an area of 4 sq. units. Investigate polygons with other areas.

www.transum.org/go/?num=79

Solutions for this and other Transum puzzles, exercises and activities are available here when you are signed in to your Transum subscription account. If you do not yet have an account and you are a teacher, tutor or parent you can apply for one by completing the form on the Sign Up page.