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=√289-225
=√64
= 8 cm
luas permukaan :2 {(12x9) +(12x8)+(8x9)}
: 2 (108+96+72)
: 552 cm²
volume = p.l.t
= 12.9.8
= 864 cm³
= √289 - 225
= √64
= 8
Luas permukaan balok adalah :
L = 2(p.l + p.t + l.t)
= 2(12.9 + 12.8 + 9.8)
= 2(108 + 96 + 72)
= 2 ( 276)
= 552 cm²
Volume balok :
V = p.l.t
= 12.9.8
= 864 cm³
semoga membantu
tandai sebagai yang terbaik ya