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l = 6 m
Luas = 78 m²
Keliling = ...
Luas = p x l
78 = p x 6
p = 78 : 6
p = 13 m
Keliling = 2 (p+l)
= 2 (13+6)
= 2 x 19
= 38 m²
#smgo bermanfaat