If the area of a trapezium is `28 c m^2` and one of its parallel sides is 6cm, find the other parallel side if its altitude is 4cm.

Explanation

let one of the unknown parallel side` =x cm`

given that area of trapezium`=28cm^2`

since area of trapezium`=(1/2)xx(add of bases)xx(height)`
so,
`28cm^2=1/2xx(6+x)xx4`
`x=8cm`
so unknown side `=8cm`