Page 53 - Key Stage 3 Geometry

10. Place the compass point on this intersect

and draw an arc which passes through the north
point and the south point.
11. Label the intercept of this arc with the

horizontal diameter with the letter A. The
distance from the west point to A is the side

length of the nonagon.

12. Place the compass point on the west point
of the first circle and adjust the arms until the

pencil touches point A – you must do this as

accurately as possible.
13. On the second circle, place the compasses

point close to the north point. Moving in a

clockwise direction, draw a circumference
intercept arc. Move the compass point to this

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