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In DeltaPQR, seg PM is median. PM=9, PQ^...

In `DeltaPQR`, seg `PM` is median. `PM=9`, `PQ^(2)+PR^(2)=290` then find length of seg `QR`.

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In `DeltaPQR`, seg `PM` is the median
`:.` by Apollonius theorem,
`PQ^(2)+PR^(2)=2PM^(2)+2QM^(2)`
`:.290=2xx81+2QM^(2)`
`:.290=162+2QM^(2)`
`:.2QM^(2)=290-162`
`:.2QM^(2)=128`
`:.QM^(2)=(128)/(2)`
`:.QM^(2)=64`
`:.QM=sqrt(64)`
`:.QM=8`
`QM=(1)/(2)QR`......(`M` is the midpoint of `QR`)
`:.8=(1)/(2)QR`
`:.QR=8xx2`
`:.QR=16`
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