Question

Find the surface area of the cylinder (I've been crying for 3 days because I can't get over this problem!)

Answer 1

SA = 301.44 in²

Explanation:

SA = 2πr² + 2πrh ← factor out 2πr from each term

= 2πr(r + h)

substitute r = 4 and h = 8

SA = 2π × 4 × (4 + 8) ← substitute π = 3.14

= 2 × 3.14 × 4 × 12

= 6.28 × 48

= 301.44 in²