tolong bantu jawab^^

a×t:2×t =18×12:2×35=3.780 cm

p×l×t=15×6×8=720 cm

Prisma ∆
LP = 2.la + ka.T
= 2.a.t/2 + (a+b+c).T
= a.t + (a+b+c).T
= 18.12 + (18+15+15).35
= 216 + 1680
= 1896 cm"
Prisma persegi panjang
LP = 2.La + ka.T
= 2.p.l + 2(p+l).T
= 2.8.6 + 2(8+6).15
= 96 + 420
= 516 cm"