Page 51 - Key Stage 3 Geometry

Now you have drawn a regular octagon, measure an
o
internal angle using your protractor. It should be 135 .
Label your drawing, ‘My regular octagon – DATE’

Exercise 3.7: A Regular Nonagon in a Circle
A nonagon is a nine-sided figure. Do the following:

1. Draw two circles of radius 6 cm separated by 4

cm on a sheet of A4 paper.
2. In the first circle, draw a vertical diameter.

3. Place the edge of a set-square along this vertical

diameter with the right-angle touching the
centre.

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