tolong dibantu 4-5 ya

5. a) L.permukaan= phi × r^2 + 2 × phi × r × t.tabung
L.permukaan= 3,14 × 0,5^2 + 2 × 3,14 × 0,5 × 12
=0,785 + 37,68
=38,465

b) Volume=1/3 × phi × r^2 × t.kerucut + phi × r^2 × t.tabung
=1/3 × 3,14 × 0,5^2 × 2 + 3,14 × 0,5^2 × 12
= 3,6633