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The sides of a right angled triangle are...

The sides of a right angled triangle are in arithmetic progression. If the triangle has area 24, then what is the length of its smallest side?

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a-d,a,a+d are in AP
`(a+d)^2=a^2+(a-d)^2`
`a^2+d^2+2ad=a^2+a^2-2ad+d^2`
`a^2-2ad-2ad=0`
`a^2-4ad=0`
`a(a-4d)=0`
`a-4d=0`
`a=4d`
...
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