Question

8. A solid cylinder of height 10cm and radius 4 cm is to be plated with material costing $11 per cm^2. Find the cost of the plating.​

Answer 1

Step-by-step explanation:

$volume \: of cylinder= \pi r^{2}h$

$3.14 \times 4 \times 4 \times 10 = 502.4cm^{2}$

for 1cm = 11$

for 502.4 = 11$×502.4

502.4

× 11

________

5024

5024×

________

55264

_________

5526.4$

Cost of the plating = 5526.4$

Answer 2

Answer:

$3870

Step-by-step explanation:

Total Surface area of cylinder = 2 x pi x r x h +2( pi x r^2)

TSA = 2 × 3.14 × 4 × 10 + 2( 3.14 ×16)

TSA = 251.2 + 100.48

= 351.68

Cost = 351.68 × 11

= $ 3870