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a.
(2,3) dan (4,7)
Titik tengah
( (2+4)/2 , (3+7)/2 )
(6/2, 10/2)
(3,5)
b.
(-5,4) dan (-9,-2)
Titik tengah
( (-5+(-9))/2 , (4+(-2))/2 )
( -14/2, 2/2 )
(-7,1)