bikin rumusnya, tolong dijawabya kak bg

rumusnya = Luas alas lingkaran × tinggi tabung
1. = phi×r2 =3,14×5×5 =78,5 ×10 = 785m
2. = phi×r2 =22/7×5×5 =78,57×14 = 1.100m
3. = phi×r2 = 3,14×7×7× = 153,85 × 15 =2.307,9cm
4. phi×r2 =22/7×14×14 = 616 × 20 = 12.320
Itu jawabannya gan