nomor 31 caranya gimana ya

Bangun Ruang
Volume = Volume Tabung + Volume Kerucut

Kerucut
d = 8 cm , r = 4 cm
s = 5 cm
t = √(s² - r²)
t = √(5²-4²)= √9
t= 3 cm
V kerucut = 1/3 π r² t
Vk = 1/3 (π)(4²)(3)
Vk = 16 π

Tabung
d = 8 cm, r = 4 cm
t = 13 - t kerucut = 13 = 3 = 10 cm
Volume Tabung = π r² t
Vt = π(4²)(10)
Vt = 160 π

Volume bangun = V tabung + V kerucut
Vb = 160 π + 60 π = 220 π cm³
atau
Vb = 220 (3,14) = 690,80 cm