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Diagonal ruang kubus :
V= s3
512=s3
s=8 cm
mencari diagonal sisi
a=akar s"+s"
a=akar 8"+8"
a=akar 64+64
a=akar 128
mencari diagonal ruang
?=akar a"+s"
?=akar (akar 128)" + 8"
?=akar 128+64
?=akar 192
?=8 akar 3 cm