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= akr (144+144)
=akr 288
= 12 akr 2
titik e ke bd = akr (12^2 + (1/2 x 12 akr 2)^2)
= akr (144 +(6 akr 2)^2)
= akr (144 + 72)
= akr 216
= 6 akr 6