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luas = 15 x 6 = 80cm persegi
luas 1/2 PP = 45cm2
panjang = 15cm
otomatis L 1/2 PP = 1/2 P x 1/2 Lebar
45 = 7,5 x 1/2 Lebar
1/2 Lebar = 45 : 7,5 = 6cm
lebar = 6x2 = 12cm
Luas = pxl
= 15 x 12 = 180cm2