Calculating the Area of a Copper Plate with Linear Expansion

[bpollard]

Homework Statement

The area of a copper plate is 0.1m^2. The coefficient of linear expansion (would be given in the problem). if the temperature increases from 22C to 100C, what is the new area of the copepr plate?

Homework Equations

L= LTá : but as alfa is linear Expansion coff

The Attempt at a Solution

I'm stuck...

 

[mathfeel]

If the plate has sides a and b such that a b = 0.1m^2. Upon heating, it would expand to:
$(\alpha \Delta T a) (\alpha \Delta T b)$.