How Much Tolerance is Needed for a Windshield to Withstand a 200°F Temperature Change?

[tdusffx]

An automobile windshield has dimensions of 60 cm by 150 cm. What minimum tolerance in mm is needed to prevent the windshield from breaking if the temperature changes by 200°F? (The linear expansion coefficient of glass is 9×10-6 (oC)-1.)

I'm thinking of using the area expansion formula but I don't understand the part where it says minumum tolerance in mm...

A = 2a(Tf-Ti)

a = alpha = 9x10^-6

 

[tdusffx]

thanks guys