Following figure shown a page in a field book of cross staff survey. Calculate the area enlarged between the stations:
1. Area of triangle AHD = 1 / 2 x 30 x 22.50 = 337.50 m²
2. Area of Trapezium HDFJ
= ( 88.0-30.0) = ( 22.50+33.80/ 2 )
= 1632 . 70m²
3. Area of Triangle BFJ = 1/2 x (120-88.0) x 33.80
= 540.80 m²
4. Area of Triangle BIE = 1 /2 x (120-63.50)×26.50
= 748.63 m²
5. Area of Trapezium IECG
= (63.50-16.50) x[ ( 26-5+38.6 ) / 2]
= 1529.85m²
6. Area of Triangle AGC = 1/2 × 16.50×38.60
= 318.45m²
Total area= 337.50+1632.70+540.80 +748.63+1529.85+318.45
= 5107.93 m²
Total area of land =5107.93 m²