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Find the area of a trapezium whose paral...

Find the area of a trapezium whose parallel sides `25 c m ,13 c m` and other sides are `15 cm and 15 cm .`

Text Solution

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Area of `triangle BEC=sqrt(21(21-15)(21-15)(21-12)`
`=sqrt(21xx6xx6xx9)=18sqrt21cm^2`
`1/2*12*h=18sqrt21`
`h=3sqrt21cm`
area of || AECD=basexxheight`=13xx3sqrt21=39sqrt21cm^2`
Area of trapezium`=(18sqrt21+39sqrt21)=57sqrt21cm^2`.
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