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10 cards from this deck
Surveying technique to map polygon-shaped land from central point
Length of radial lines & angles between them at central point
Origin - central reference point for all measurements
Lines from central point to corners of polygon
In centre, on boundary, or outside the land area
Divide into triangles, calculate each area, then add together
A=12×a×b×sinCA = \frac{1}{2} \times a \times b \times \sin CA=21×a×b×sinC
c2=a2+b2−2abcosCc^2 = a^2 + b^2 - 2ab \cos Cc2=a2+b2−2abcosC
Clockwise from north, marked with T
Subtract from 360° to get angle anticlockwise from north
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