Page 34 - Key Stage 3 Geometry

compasses to draw circles. When using your

compasses, push the point firmly into the paper, hold
the grip at the top and just rotate them in an even

manner - this may take some practice to get an even

circle.

3.1 Inscribing Polygons in a Circle

In this section we are going to draw regular polygons

within a circle – regular means
all sides are of equal length. It

will be useful to have some

coloured gel pens (similar to the
ones shown on the left) to draw

each polygon. We shall start
with a three-sided figure (a

triangle) and work up to a nonagon (a nine-sided

figure). In the following exercises we shall refer to
specific points on the circle

circumference as indicated by

the image on the left. You
should know your east point

from your west point!

28