tolong jawab ya plisss pake cara

Aku bantu 2 nomor okey :)

[20.]
d=20 cm, r=10 cm
t=30 cm

V=⅓ πr²t
=>⅓ • 3,14 • 10² • 30
=>31,4 • 100
=>3140 cm³

[21.]
r=8 cm
t=15 cm
s=√(t²+r²)
s=√(15²+8²)
s=√289
s=17 cm

Lp=πr(r+s)
=>3,14 • 8(8+17)
=>3,14 • 200
=>628 cm²