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Question
Show that the points A(3,0), B(4,5), C(-1,4) and D(-2,-1) are the vertices of a rhombus. Find its area.
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Solution
The given points are A(3,0), B(4,5), C(-1,4) and D(-2,-1)
`AB = sqrt((3-4)^2 + (0-5)^2 ) = sqrt((-1)^2 +(-5)^2)`
`= sqrt(1+25) = sqrt(26)`
`BC = sqrt((4+1)^2 +(5-4)^2) = sqrt((5)^2 +(1)^2)`
`= sqrt(25+1) = sqrt(26)`
`CD = sqrt((-1+2)^2 +(4+1)^2) = sqrt((1)^2 +(5)^2)`
`= sqrt(1+25) = sqrt(26)`
`AD = sqrt((3+2)^2 +(0+1)^2) = sqrt((5)^2 +(1)^2)`
`= sqrt(25+1) = sqrt(26)`
`AC = sqrt((3+1)^2 + (0-4)^2) = sqrt((4)^2+(-4)^2)`
`= sqrt(16+16) =4sqrt(2)`
`BD = sqrt((4+2)^2 +(5+1)^2 ) = sqrt((6)^2+(6)^2)`
`= sqrt((36+36)) = 6 sqrt(2) `
`∵ AB = BC =CD =AD = 6 sqrt(2) and AC ≠ BD `
Therefore, the given points are the vertices of a rhombus
Area (Δ ABCD ) =`1/2 xx AC xxBD`
`= 1/2 xx 4 sqrt(2) xx 6 sqrt(2 ) = 24 ` sq. units
Hence, the area of the rhombus is 24 sq. units.
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