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60 m तथा 40 m भुजाओं वाले समानन्तर चतुर्भुज का एक विकर्ण 80m है। चतुर्भुज का क्षेत्रफल ज्ञात करें?
A. `500sqrt(15)m^(2)`
B. `600sqrt(15)m^(2)`
C. `400sqrt(15)m^(2)`
D. `450sqrt(15)m^(2)`

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Correct Answer - B
image
`S(DeltaABD)=(60+80+40)/2=90`
`arDeltaABD`
`=sqrt(90(90-80)(90-60)(90-40))`
`=sqrt(90xx10xx30xx50)`
`=300sqrt(15)m^(2)`
`arsquareABCD=2xxarDeltaABD`
`=600 sqrt(15)m^(2)`

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