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KLMN=4*9=36
perbandingan keliling 3:5
luas: ABCD=18*12=216
KLMN=9*9=81
perbandingan luas 8:3
= 2(18+12) = 4 x 9
= 2 x 30 = 36
= 60
60:36 => 5:3
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b) Luas ABCD= P x l Luas KLMN = s x s
= 18 x 12 = 9 x 9
= 216 = 81
216:81 => 8:3
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