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K = 28 cm
p = 2 +l
Ditanya : Luas persegi panjang ??
Dijawab :
K = 2(p +l)
28 = 2((2 +l) +l)
28 = 4 +2l +2l
28 -4 = 4l
4l = 24
l = 24/4
l = 6
p = 2 +l
= 2 +6
= 8
Luas = p x l
= 8 x 6
= 48 cm²
Jadi, jawabannya adalah c.
Itu jawabannya.