Trees belonging to the first group could be considered as monuments of permanent nature to be used in defining and marking corners when it has a diameter from what to what centimeters?

• A. 15 to 50 cm
• B. 10 to 30 cm
• C. 20 to 60 cm
• D. 5 to 25 cm

Answer: (A)

In surveying, certain trees can serve as permanent monuments to mark corners, but only if they are a suitable size and likely to endure over time. Trees with a diameter in the range of 15 to 50 cm strike a practical balance: they are mature enough to be clearly recognizable and long-lasting, yet not so large or old that marking or maintenance becomes problematic. A tree within this band is unlikely to be easily removed or to die off quickly, and it’s easy enough to measure and mark at standard heights (often at a defined diameter at breast height) without causing excessive harm. Trees smaller than about 15 cm may not be durable enough for long-term permanence, while trees thicker than about 50 cm pose greater risk of decay, change, or disputes over their future if used as official markers. Therefore, the best choice for a first-group tree suitable as a permanent corner monument is a diameter between 15 and 50 cm.