tolong isiin nomor 39 dan 40 pakai cara

39. L = La + 4 × L. segitiga

= (s×s) + 4 × (1/2 × A × T)

= (12×12) + 4 × (1/2 × 12 × 8)

= 144 + 4 × (1 × 6 × 8)

= 144 + 4 × 48

= 144 + 192

= 336 cm^2



40. V = 1/3 × La × T

= 1/3 × (s×s) × T

= 1/3 × (24×24) × 16

= 1/3 × 576 × 16

= 1 × 192 × 16

= 3.072 cm^3

40. v = 24*24*16/3
         =  3072 (o)

39. LP = La + 4* Lsegitiga
            = 12 *12 + (4 *(12*10/2))
            = 144+240
            = 384