A circular disk expands and contracts when heated/cooled.

SaltyPoro

New member
Joined
Nov 6, 2017
Messages
15
I'm clueless about how to solve this question, please show step by step.

A circular disc of metal has a radius of xcm. When it is heated to a particular temperature it expands and the radius of xcm increases by 2cm. When it has cooled to a particular temperature it contracts and the radius of xcm is decreased by 2cm.
Show that the difference between the area when it has heated and the area when it has cooled, is 8xpi.

This is an extension question my teacher gave me, I'm not sure what to apply.
 

lev888

Junior Member
Joined
Jan 16, 2018
Messages
211
What are you currently studying? What are the key words in the problem? What are the relevant formulas?
 
Top