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1440= 15x12xt
1440=180t
t=1440/180
t=8
Luas balok : ( pxl + pxt + lxt )= 15x12 + 15x8 + 12x8=180+ 120+ 96=396
= 1440 : ( 15 × 12 )
= 1440 : 180
= 8 Cm
LPK = ( 2 × p × l ) + ( 2 × p × t ) + ( 2 × l × t )
= ( 2 × 15 × 12 ) + ( 2 × 15 × 8 ) + ( 2 × 12 × 8 )
= 360 + 240 + 192
= 600 + 192
= 792 Cm2