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Verified answer
Jawabmisal x = lebar bagian bawah foto
x = 4/40 ( 2x 60 - 40)
x = 1/10 (40)
x= 4 cm
Ukuran foto
p = 40 -8 = 32
t = 60 - 4 - 4 = 52
luas yg tidak tertutup = 40 x 60 - 32 x 52 = 736