tolong no 36 dgn cara ya

Lp bangun = Lp balok + Lp limas
= (2(p.l+p.t+l.t)) + (L alas + jumlah luas sisi tegak)
= (2(10.10 + 15.10 + 15.10) + ( 100 +(½ . a . t∆ . 4))
= (2 . 400) + ( 100 + ( ½ . 10 . 13 . 4))
= 800 + (100 + 260)
= 800 + 360
= 1060cm²

ps: t∆² = t limas² +(½.10)²
= 12² + 5²
= 144 + 25
= 169
t∆ = √169
= 13cm