Page 55 - Key Stage 3 Geometry

Now you have drawn a regular nonagon, measure an
o
internal angle using your protractor. It should be 140 .
Since you have already created a pentagon, you are

able to draw a decagon (10 sided figure) where the

side length will be half that of the pentagon.

Exercise 3.8: Connecting the Vertices of

Polygons

Now you have created several polygons, you may
consider drawing a fresh set of polygons and draw

lines between their vertices, then add some colour.
You will find some interesting results.

The pentagon: you will see in

at the centre another
pentagon surrounded by five

isosceles triangles. The figure

also looks like a star.
The hexagon: you will see
another hexagon formed in

the centre surrounded by six
equilateral triangles.

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