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K= 2(p+l)
90= 2(6+l+l)
90= 2(6+2l)
90= 12+4l
78=4l
l=78 ÷ 4
=19.5
90 = 2( l+6 + l)
90 = 2(2l + 6)
90 =4l + 12
78 =4l
lebar = 19,5 cm