1. Stonemasonry Department 2013
Prepare Templates and Moulds
Constructing a Heptagon (approximation)

2. Constructing a Heptagon
Begin by
marking a circle
with the centre
point C.
C

3. Constructing a Heptagon
BA C
Begin by marking a
circle with the
centre point C.
Mark the
diameter of the
circle to form
line AB

4. Constructing a Heptagon
Begin by marking a
circle with the
centre point C.
Mark the diameter
of the circle to form
line AB
Using centre
points A and B
and using BC as a
radius construct
arcs intersecting
the large circle to
form points D
and E
BA C
D E

5. Constructing a Heptagon
Begin by marking a
circle with the
centre point C.
Mark the diameter
of the circle to form
line AB
BA C
D E
Using centre points
A and B and using
BC as a radius
construct arcs
intersecting the
large circle to form
points D and E
Mark lines BD
and CE to form
point F
F

6. Constructing a Heptagon
Construct an arc
with centre point
B and radius BF
BA C
D E
F

7. Constructing a Heptagon
Construct an arc
with centre point
B and radius BF
BA C
D E
F
Mark the diameter
of the circle to form
line AB

8. Developed by The Stonemasonry Department
City of Glasgow College
2013