Renata is completing a craft project that involves covering only the lateral surface of a cylindrical container with fabric. The cylinder has a height of 12.8 in. and a radius of 15.1 in. To the nearest square unit, how much fabric does she need for this project? Use a calculator.
A. 1,214 in.2

B. 2,040 in.2

C. 2,647 in.2

D. 1,931 in.2

Question

Renata is completing a craft project that involves covering only the lateral surface of a cylindrical container with fabric. The cylinder has a height of 12.8 in. and a radius of 15.1 in. To the nearest square unit, how much fabric does she need for this project? Use a calculator. 
 A. 1,214 in.2  
 
 B. 2,040 in.2  
 
 C. 2,647 in.2  
 
 D. 1,931 in.2

zepdrix · Answer

Hmm, so what type of problem is this? Volume? Surface Area?
Can you tell based on the way it's worded? :)

anonymous · Answer

wellll is said surdace

zepdrix · Answer

Yesss good :D
Do you remember the formula for Surface Area of a Cylinder?
$$\huge A=2\pi r^2+2\pi r h$$ But in this problem, we only care about the LATERAL area, so we'll ignore the area of the top and bottom.$$\huge A=2\pi r h$$

zepdrix · Answer

From here it shouldn't be too bad!
Just plug in the numbers they gave you. :D

Lemme know if you're stuck on any part.

anonymous · Answer

so is 2pi*r*h

zepdrix · Answer

yes, that will give you the amount of lateral area that you need to cover with fabric.
they gave you -r and h- in the question.

If your calculator doesn't have a PI button, use 3.14, you should still get close to the correct answer.