tolong di bantu sihhh plisss

No.26
2(12x15) + 2(12x30) +2(15x30)
=2.180+ 2.360 +2.450
=360 + 720 + 900
=1980cm

No.28
Vkubus = 10^2 = 100cm^3
Vbalok = 30.10.15 = 4500cm^3

No.30
A.a

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