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384=12.d2
d2=32
s= akar 16^2+12^2
s=akar 256+144
s=akar 400
s=20
Keliling=4s=4.20=80 cm
384 = 24 × d2 :2
768 = 24 × d2
32 = d2
12²+16² = 144 + 256 = √400 = 20
keliling = 20 ×4 = 80