Look at the pictures of watchtowers and any other types of watchtowers that you can find in books or on the Internet. On your own, list the advantages and disadvantages of each design. Then, draw initial idea sketches of your watchtower.

Step 1: Determine total height.
The lamppost must be between 4 m and 6 m tall. Choose $h = 5$ m total height.

$h = 5 \, m$

Step 2: Design the pole.
Pole height = 4 m (leaves 1 m for arm and light).

$h_pole = 4 \, m$

Step 3: Design the base.
Use regular hexagon ($n=6$ sides). Side length $s = 0.4$ m.
Perimeter $P = n \times s$.

$P = 6 \times 0.4 = 2.4 \, m$

Step 4: Design the arm.
Arm has 3 bends (4 straight sections), total arm length 0.8 m. Each section $l_section = 0.2$ m.

$l_section = \frac{0.8}{4} = 0.2 \, m$

Step 5: Design the light.
Sphere with diameter $d = 0.2$ m, radius $r = 0.1$ m.

$r = \frac{0.2}{2} = 0.1 \, m$

Step 6: Apply scale for drawing ($1$ cm $= 1$ m).
Pole drawing height: $4$ cm.
Total height drawing: $5$ cm.
Base side drawing: $0.4$ cm.
Arm section drawing: $0.2$ cm.
Light diameter drawing: $0.2$ cm.

Final design summary: Total height $5$ m, base perimeter $2.4$ m, scale $1$ cm $= 1$ m.

5 m