Question

In a cross staff survey, the perpendicular offsets are taken on right and left of the chain line $AD$ as shown in figure - all values are in meters. The area enclosed by $ABCDEFA$, computed by trapezoidal method is

• A. $3650m^2$
• B. $3200m^2$
• C. $3475m^2$
• D. $3500m^2$

Answer 1

The correct option is C $3475m^2$

$Area==\frac{1}{2}[20\times 30+(20+30)\times 15+30\times 45+25\times 30+(40+30)\times 30+30\times 40]$
=$3475m^2$