3.1 MAP SKILLS AND CALCULATIONS
Refer to the topographic map - NSC Geography - Question 3 - 2023 - Paper 2
Question 3
3.1 MAP SKILLS AND CALCULATIONS
Refer to the topographic map.
3.1.1 When calculating an area on the map, the scale is used to...
A represent the area on the topog... show full transcript
Worked Solution & Example Answer:3.1 MAP SKILLS AND CALCULATIONS
Refer to the topographic map - NSC Geography - Question 3 - 2023 - Paper 2
Step 1
3.1.1 B
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Answer
To calculate the area on the topographic map accurately, we must understand that the scale allows us to determine real-world dimensions from the map. The option B indicates calculating the area in reality based on the scale provided.
Step 2
3.1.2 Calculate the area in km²
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Answer
Using the formula for area:
Area=Length(L)×Breadth(B)
Given:
Measured Length (L) = 3.7 cm
Assume a breadth value based on the proportionate measurements from the map (let's take it as 1.85 cm for illustrative purposes).
Thus:
Area = 3.7 cm × 1.85 cm
Convert cm² to km²:
1 km² = 10^4 cm², so:
Area in km²=104(3.7×1.85)=0.000685km2
Step 3
3.1.3 True bearing
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Answer
The true bearing from trigonometric station 286 (F) in block B4 to spot height 1 357 (G) in block C5 is calculated as: 161°. This indicates the angle measured clockwise from north.
Step 4
3.1.4 Magnetic declination for 2023
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Answer
To calculate the magnetic declination for 2023, we first determine the total change over 3 years:
Total change = 3 years × 10' = 30'
Magnetic Declination for 2023:
Given traditional true north bearing is 21° 30' W, adjust with the total change:
