Question

Yang di silang yaaa

Answer 1

13) V.limas = 1/3.L alas.t
6.000 = 1/3.30².t
6.000 = 1/3.900.t
6.000 = 300.t
t = 6000/300
t = 20 cm.

1/2 . alas = 1/2 . 30 = 15 cm
maka :
t.bidang tegak = akar dr 15²+20²
= akar dr 225+400
= √625
= 25 cm

jadi, jumlah L sisi tegak = 4.L alas.t
= 4.1/2.a.t
= 4.1/2.30.25
= 1500 cm²(D)

14) 1/2 . alas = 1/2.18 = 9 cm
maka :
t.bidang tegak = akar dr 9²+ 12²
= akar dr 81+144
= √225 = 15 cm

jadi, Lp.limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= 18² + 4.1/2.18.15
= 324 + 540
= 864 cm²(B)

15) Lp.limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= (3².15000) + (4.1/2.3.2,5).20000
= 9 . 15000 + 15 . 20000
= 135000 + 300000
= 435000 rupiah