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//
//
a1=0,a2=3.0,
b1=2.20,b2=5.50,
c1=1.75,c2=3.0,
d1=1.5,d2=0,
e1=4.75,e2=5.25,
f1=6.40,f2=7.30,
g1=0,g2=3.0,
printf("\n at station 1')
sp=(e1*d2)+(f1*e2)+(d2*f2)+(c1*d2)+(b1*c2)+(a1*b2)
sq=(e2*d1)+(e1*f2)+(f1*g2)+(d1*c2)+(c1*b2)+(b1*a2)
area1=0.5*(sp-sq)
area1=abs(area1)
printf("\n sp= %0.3f,sq= %0.3f",sp,sq)
printf("\n area = %0.3f sq. meter",area1)
a1=0,a2=3.0,
b1=3.1,b2=5.25,
c1=2.20,c2=3.0,
d1=2,d2=0,
e1=5.25,e2=6,
f1=7.40,f2=8.5,
g1=0,g2=3.0,
printf("\n at station 2')
sp1=(e1*d2)+(f1*e2)+(d2*f2)+(c1*d2)+(b1*c2)+(a1*b2)
sq1=(d1*e2)+(e1*f2)+(f1*g2)+(d1*c2)+(c1*b2)+(b1*a2)
printf("\n sp1= %0.3f,sq1= %0.3f",sp1,sq1)
area2=0.5*(sp1-sq1)
area2=abs(area2)
printf("\n area = %0.3f sq. meters",area2)
printf("\n volume by average end area rule')
v=50*((area1+area2)/2)
printf("\n volume= %0.3f cu. meters",v)
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