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## Homework Statement

the bimetallic strip has a thickness x and is straight at temp T.

What is the radius of curvature of the strip, R, when it is heated to temp T+dT

Coeff. of linear expansion: a1, a2.

Assume each each metal has a thickness of x/2 and X<<R

## Homework Equations

L1=L0(1+a1 dT)

L2=L0(1+a2 dT)

## The Attempt at a Solution

I was givin the hint that:

L2=(R+x/4)theta

L1=(R-x/4)theta

Where on earth do this +-x/4 come from?!