Mohan wants to buy a trapezium shaped field. Its side along the river is parallel to and twice the side along the road. If the area of this field is `10500 m^2` and the perpendicular distance between the two parallel sides is 100 m, find the length of the side along the river.

Explanation

let parallel side along road`=x m`
parallel side along river `=2xm`

area of trapezium`=1/2xx`(add of bases)`xxheight`
according to question
`10500m^2=1/2xx(x+2x)xx100m`
`x=70m`
so length of side along river`=2xx70m`
`=140m`