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
