Question 337559
Use the midpoint formula,
{{{xm=(x1+x2)/2}}}
{{{2=(0+x2)/2}}}
{{{x2=4}}}
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{{{ym=(y1+y2)/2}}}
{{{5=(9+y2)/2}}}
{{{10=y2+9}}}
{{{y2=1}}}
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B:({{{4}}},{{{1}}})
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Now do the same for the second set.