Distance, Area, and Gradient (Grade 12 NSC Matric Geography): Flashcards

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Mapwork calculations: Distance, area, and gradient
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Three main mapwork calculation types

Distance, area, and gradient

Distance formula (mapwork)

AD = MD × S (Actual = Map × Scale)

Topographic map scale (typical)

1:50,000 (1 cm = 0.5 km)

Orthophoto scale (typical)

1:10,000 (1 cm = 0.1 km)

Straight line vs actual distance difference

Straight is direct; actual follows path curves

Area formula (mapwork)

A = L × B (Area = Length × Breadth)

Gradient formula

G = H/D (Gradient = Height/Distance)

How gradient is expressed

As a ratio (e.g., 1:20)

Area calculation units

Square kilometres (km²) or square metres (m²)

Topographic map: cm to km conversion

Multiply map distance by 0.5

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