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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 c ma n d15 c mdot`

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area of `triangle BEC=sqrt(21(21-15)(21-15)(21-12)`
`=sqrt(21*6*6*9)=18sqrt21cm^2`
`1/2*12*h=18sqrt21`
`h=3sqrt21cm`
area of || AECD=base*height`=13*3sqrt21=39sqrt21cm^2`
Area of trapezium`=(18sqrt21+39sqrt21)=57sqrt21cm^2`.
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