Find the two parallel side of a trapezium whose area is 1.6m altitude is10dm and one of the parallel side is longer than other by 8dm
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let one parallel side be x
and other parallel side be x+8
area=1/2*sum of parallel side *height
1600cm=1/2*(x+(x+8))*10
1600=1/2*(2x+8)*10
1600=2x+8*5
1600=2x+40
2x=1600-40
2x=1560
x=1560/2
x=780cm
x=7.8m
1st side=7.8m
2nd side=7.8+8=15.8m
and other parallel side be x+8
area=1/2*sum of parallel side *height
1600cm=1/2*(x+(x+8))*10
1600=1/2*(2x+8)*10
1600=2x+8*5
1600=2x+40
2x=1600-40
2x=1560
x=1560/2
x=780cm
x=7.8m
1st side=7.8m
2nd side=7.8+8=15.8m
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