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P x L x T = 810
5a.3a.2a = 810
30a³ = 810
a³ = 810/30= 27
a³ = 3x3x3
a= 3
P= 5a= 5(3)=15
L=3a=3(3)=9
T= 2a=2(3)=6
LP = 2(PL+PT+LT)
=2( 15(9) +15(6) +9(6))
= 2(135+90+54)
= 2(279)
= 558cm²
Perbandingan V. Balok
= 2 ( 5 . 3 + 5 . 2 + 3 . 2 ) x 810 cm³
5 . 3 . 2
= 2 ( 15 + 10 + 6 ) x 810 cm³
30
= 2 ( 31 ) x 810 cm³
30
= 62 x 810 cm³
30
= 1674 cm²
JADI, LUAS BALOK TSBT = 1674 cm²