Answer :

Answer:

270π

Step-by-step explanation:

From formula,

SA = πrl + πr^2

= π × 9 × 21 + (π × 9 × 9)

= 189π + 81π

= 270π square centimeters

SA = πrl + πr^2

= π × 3× 8 + (π × 3 × 3)

= 24π + 9π

= 33π square centimeters

Using Pythagoras' Theorem, (3,4,5)

l = 5cm and r = 4cm

SA = πrl + πr^2

= π × 4× 5 + (π × 4 × 4)

= 20π + 16π

= 36π square centimeters