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= √12^2 + 6^2 = √144 + 36
= √180 = 6√5 cm
b. D.ruang = √p^2 + l^2 + t^2
= √12^2 + 6^2 + 4^2
= √144 + 36 + 16
= √196 = 14 cm
Maaf kalau salah :)