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//
//s
printf("\n chainage 0 and 20')
a1=0,b1=20,
//finding base and height of each triangle
base=b1-a1
o1=0,o2=42,
mo1=(o2+o1)/2
//calculating area
ae1=base*mo1
printf("\n area ACG= %0.3f sq m",ae1)
printf("\n chainage 20 and 65')
a1=20,b1=65,
base=b1-a1
o1=58,o2=42,
mo2=(o2+o1)/2
ae2=base*mo2
printf("\n area IEB= %0.3f sq m",ae2)
printf("\n chainage 65 and 110')
a1=65,b1=110,
base=b1-a1
o1=0,o2=58,
mo3=(o2+o1)/2
ae3=base*mo3
printf("\n area DHA= %0.3f sq m",ae3)
printf("\n chainage 90 and 110')
a1=90,b1=110,
base=b1-a1
o1=0,o2=60,
mo4=(o2+o1)/2
ae4=base*mo4
printf("\n area BFJ= %0.3f sq m",ae4)
printf("\n chainage 40 and 90')
a1=40,b1=90,
base=b1-a1
o1=60,o2=20,
mo5=(o2+o1)/2
ae5=base*mo5
printf("\n area FJHD= %0.3f sq m",ae5)
printf("\n chainage 0 and 40')
a1=0,b1=40,
base=b1-a1
o1=20,o2=0,
mo6=(o2+o1)/2
ae6=base*mo6
printf("\n area DHA= %0.3f sq m",ae6)
area=ae1+ae2+ae3+ae4+ae5+ae6
printf("\n area of field = %0.3f sq m",area)
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