In the rectangular survey system, how many acres are contained in a standard section?
Correct Answer
C) 640 acres
A section in the rectangular survey system is one square mile, which equals 640 acres (1 mile × 1 mile = 640 acres).
Why This Is the Correct Answer
Option C (640 acres) is correct because a section is defined as exactly one square mile in the rectangular survey system. Since there are 640 acres in one square mile, a standard section contains exactly 640 acres. This is a fixed measurement that never varies - every section in the rectangular survey system is 1 mile × 1 mile = 640 acres. This fundamental unit serves as the basis for all smaller subdivisions within the section.
Why the Other Options Are Wrong
Option A: 160 acres
160 acres represents a quarter-section, which is one-fourth of a full section (640 ÷ 4 = 160 acres).
Option B: 320 acres
320 acres represents a half-section, which is one-half of a full section (640 ÷ 2 = 320 acres).
Option D: 1,280 acres
1,280 acres would be two full sections combined (640 × 2 = 1,280 acres), not a single section.
Six-Forty Section Rule
Remember 'SIX-FORTY SECTION' - the number 640 contains the key digits 6 and 4, representing 6 miles × 6 miles in a township with sections arranged in a 6×6 grid, and each section is 640 acres. You can also remember that 640 = 64 × 10, and think '64 tens of acres in a section.'
How to use: When you see any question about section acreage, immediately think 'SIX-FORTY SECTION' and recall that 640 is the magic number for a full section. If the question asks about fractions of sections, divide 640 accordingly (half-section = 320, quarter-section = 160).
Exam Tip
Always double-check section-related calculations by remembering that 640 acres = 1 section = 1 square mile. If you see other acreage amounts, determine what fraction of 640 they represent to identify the portion of the section being described.
Common Mistakes to Avoid
- -Confusing section acreage (640) with quarter-section acreage (160)
- -Mixing up township size (36 square miles) with section size (1 square mile)
- -Forgetting that section acreage is always 640 regardless of the state or location within the rectangular survey system
Concept Deep Dive
Analysis
This question tests fundamental knowledge of the rectangular survey system (also called the Public Land Survey System), which is the primary method of land description used in most western and midwestern states. The rectangular survey system divides land into a grid pattern starting with townships that are 6 miles × 6 miles, which are then subdivided into 36 sections of 1 mile × 1 mile each. Understanding the acreage contained in a section is crucial for property descriptions, boundary determinations, and area calculations in real estate appraisal. This is foundational knowledge that appraisers must know to properly interpret legal descriptions and calculate property sizes.
Background Knowledge
The rectangular survey system was established by the Land Ordinance of 1785 to create a systematic method for surveying and describing land in the United States. The system creates a grid where townships are 6 miles × 6 miles (containing 36 sections), and each section is 1 mile × 1 mile (containing 640 acres). Understanding that 1 square mile always equals 640 acres is fundamental to working with this survey system.
Real-World Application
When appraising rural properties, appraisers frequently encounter legal descriptions using the rectangular survey system, such as 'the NE 1/4 of Section 15.' The appraiser must know that this represents 160 acres (1/4 × 640 = 160) to properly calculate the property size, determine comparable sales on a per-acre basis, and assess the property's highest and best use based on its acreage.
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