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=2( (55.15) + (55.50) +(15.50))
= 2 x (825 + 2750 + 750)
= 2 x 4325
= 8650 (luas)
NB : tanda (.) sama aja kaya tanda kali (x)
L=2(55.15+55.50+15.50)
L=2(4325)
L=8650