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Find the sum of the lengths of the bases...

Find the sum of the lengths of the bases of a trapezium whose area is `4.2\ m^2` and whose height is 280 cm.

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given height `h=280m`
area of trapezium`=1/2(add of bases)xxh`
according to question
`4.2m^2=1/2xx`(add of length of bases)`xx(280m)/100`
add of bases`=3m`
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