Tolong no dua aja plis yg jwb msk surga

02.a

r = 7 cm
r2 = 49 Cm
r3 = 343
T = 15 - 7
= 8 Cm

Volume kerucut
= 1/3 x n x r2 x T
= 1/3 x 22/7 x 49 x 8
= 1/3 x 1.232
= 410.6 Cm3


Volume 1/2 Bola
= 1/2 x 4/3 x n x r3
= 1/2 x 4/3 x 22/7 x 343
= 718.6 Cm3

Volume total
= 410.6 + 718.6
= 1,129.2 Cm3



02.b

P = 30 Cm
L = 20 Cm
T = 10 Cm
D = 20 Cm
R = 10 Cm
R2 = 100 Cm

Volume balok
= P x L x T
= 20 x 30 x 10
= 600 Cm3

Volume 1/2 tabung
= 1/2 x n x r2
= 1/2 x 3.14 x 100
= 157 Cm3

Volume Total
= 600 + 157
= 757 Cm3


Maaf kalau benar ya kak, soalnya dikelas memang saya gak terlalu cerdas.