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12 a² = 96 x 2
12 a² = 192
a² = 192/12
a² = 16
a = √16
a = 4
diagonalnya
D1 = 3 x 4
= 12
D2 = 4 x 4
= 16
96= 12a/2
12a²= 96×2
12a²= 192
a²= 192/12= 16cm
a=√16= 4
3a= 4×3= 12
4a= 4×4= 16