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किसी सम चतुर्भुज का परिमाप 40 सेमी तथा एक कोण `60^(@)` हो तब क्षेत्रफल ज्ञात करें?
A. `100 sqrt(3)cm^(2)`
B. `50 sqrt(3)cm^(2)`
C. `160 sqrt(3) cm^(2)`
D. `100 cm^(2)`

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Correct Answer - B
image
as `square ABCD` is a rhombus
`:. Delta ABC` is equilateral
`implies Delta ABC=(sqrt(3))/4xx10xx10`
`=25sqrt(3)cm^(2)`
`implies arsquare ABCD=25sqrt(3)xx2`
`=50sqrt(3)cm^(2)`

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