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Are the points A(3,6,9),\ B(10 , 20 , 30...

Are the points `A(3,6,9),\ B(10 , 20 , 30)a n d\ C(25 ,-41 ,5),` the vertices of a right angled triangle?

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Given `A(3,6,9),\ B(10 , 20 , 30)a n d\ C(25 ,-41 ,5),`
`AB=sqrt((3-10)^2+(6-20)^2+(9-30)^2)`
`=sqrt686`
`=BC=sqrt((10-25)^2+(20+41)^2+(30-5)^2)`
...
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