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891 = 11 s^2
891 : 11 = s^2
81 = s^2
s= ✓81
s = 9 cm
semoga membantu(:
V = 891
t = 11
mk :
V = luas als x tinggi
891 = luas las x 11
luas alas = 891/11
luas alas = 81
jd sisi pesegi dlh :
Luas als = sisi²
sisi = √81
sisi = 9 cm