Question

I WILL MEDAL CX
A stack of quarters is packed in a plastic tube 4 inches tall. The diameter of each quarter is 0.94 inch. What is the approximate surface area of the cylinder formed by the stack of coins? (Use 3.14 for .)

2.77 in2
18.4 in2
3.76 in2
13.19 in2

Answer 1

Sa=2πrh+2πr2

h= 4
r=.94/2 = .47
sa=2π(.47)(4)+2π(.47)2

sa=2π(1.88)+2π(.2209)

sa=3.76π+.4418π

sa=4.2018π

sa=4.2018×3.14

sa=13.193652≈13.19

Answer 2

whoaa my head is gonna explode XD thanks cx

Answer 3

no prob