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L = (√10 + √2)(√10 - √2)
L = 10 - √20 + √20 - 2
L = 8 cm²
Jawaban: B
15. diagonal sisi = 8√2
r√2 = 8√2
r = (8√2)/√2
r = 8 cm
V = r³
V = 8³
V = 512 cm³
Jawaban: B