You could use the rise over run method
Find the difference between the first endpoint and midpoint x values which in this case would be +2 because(5-3=2)
Then do the same for their y values(-11-6)=?
After that add the difference in x values to the the midpoint x value(5+2)=
And the same for its y value(-11+?)=?
That will give you your second endpoint
Find the other endpoint given the first endpoint and the midpoint A = (3, 5) B = (5, -11) find C
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