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15 cards from this deck
Approximate area of irregular shapes
Engineers and surveyors
h2[first+last+2(remaining)]\frac{h}{2}[\text{first} + \text{last} + 2(\text{remaining})]2h[first+last+2(remaining)]
Width of each strip
Offsets or ordinates
y1y_1y1, the starting measurement
yny_nyn, the ending measurement
y2,y3,y4y_2, y_3, y_4y2,y3,y4, etc. - measurements between first & last
n+1n + 1n+1 ordinates
6 ordinates
h2(a+b)\frac{h}{2}(a + b)2h(a+b)
differencetrue value×100%\frac{\text{difference}}{\text{true value}} \times 100\%true valuedifference×100%
Use more strips (narrower widths)
Approximation, not exact value
Add ordinates above and below at each point
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