Posted by rose on Tuesday, September 11, 2012 at 10:17pm.
If we let M be the midpoint,
S-M = (0,8) - (6,-10) = (-6,18)
that means that M-R must also be (-6,18), or R = M-(-6,18)
R = (6,-10) - (-6,18) = (12,-28)
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