1. berapa volume kerucut dgn pnjang diameter alas 20cm dan panjang garis pelukis 26cm phi 3,14 dimana cara menghitungnya ? 2.hitunglah volume kerucut dgn luasse

Jawabanya:
1)V = 1/3 x phi x r2 x s
= 1/3 x 3,14 x 20/2 x 20/2 x 26
= 1/3 x 314 x 26
= 8164 : 3
= 2.721,3

r2 nya bisa 20/2 / 10

2) LS = phi x r x s
550 = 22/7 x r x 25
r = 550 : 22/7 : 25/ 1
r = 550 x 7/22 x 1/ 25
r = 550 : 25 = 22,trus 22 : 22 = 1
r = 7
V = 1/3 x phi x r2 x s
= 1/3 x 22/7 x 7 x 7 x 25
= 3.850 :3
V = 1.28,3

Maaf ya kalo salah