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lalu:
80cm × 5/8 = 50cm
80cm × 3/8 = 30cm
L = p×l
L = 50×30
L=1500m² (D)
80 = 2* (p+l)
80/2 = p + l
40 = p+l
p = 5/8 * 40 =25
l = 3/8 * 40= 15
Luas = p*l
= 25*15
= 375