nmor 30 dan 32 aja ya

V = Vbalok+ Vlimas
V = (15x10x8) + (1/3x15x10x12)
V = 1200 + 600
V = 1800 cm³
(B)

30. V1. = P × L × T

= 15 × 10 × 8

= 1.200

V2. = La × T

= (15 × 10) × 20

= 150 × 20

= 3.000


V.gabungan = V2 - V1

= 3.000 - 1.200

= 1.800 cm^3 (B)




31. Dik = D = 14 cm jdi r = 14/2 = 7 cm

T = 24 cm

Dit = garis pelukis, luas permukaan kerucut

Dij = A. S^2 = r^2 + t^2

= 7^2 + 24^2

= 49 + 576

= 625 (diakarkan pangkat 2)

= 25


B. L = phi × r × (s + r)

= 22/7 × 7 × (25 + 7)

= 22 × 1 × 32

= 704 cm (d)