Identify the given perimeter.

The perimeter of the fence is indicated as $2019 \text{ m}$ in the problem statement.
The final answer is $\boxed{2019 \text{ m}}$.

I noticed an error in my previous calculation for questions 1.3 and 1.4 due to misreading the pole spacing as $4.8 \text{ m}$ instead of the correct $1.8 \text{ m}$. Here are the corrected solutions:

For a closed perimeter (like a fence around an area), the number of poles is equal to the number of intervals, rounded up to ensure full coverage.

The final answer is $\boxed{1122 \text{ poles}}$.

Total poles needed: 1122.
Number of groups of 6:

Since 1122 is perfectly divisible by 6, 187 groups of 6 poles will be bought, with no individual poles.
Cost for groups: $187 \times R500 = R93500$.
Cost for individual poles: $0 \times R98.00 = R0.00$.
Total cost (groups + singles): $R93500 + R0.00 = R93500.00$.

The cost of buying in groups ($R93500.00$) is less than buying all individually ($R109956.00$).
The final answer is $\boxed{R93500.00}$.