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p = ?
l = ?
JAWAB =
p = 78 : 4 (karena persegi)
p = 19,5
l = p - 3 : 5
l = 19,5 - 3 : 5
l = 16,5 : 5 = 3,3
luas = 3,3 x 19,5 = 64,35
sorri klo salah......