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## Homework Statement

A Cylindrical Tube of Length 35m, inner radius = 2.5m

The tube is lines with 6cm thick insulation where k = 4X10^-5.

The inside temp=25 degrees celcius

Find the rate of heat delivered if the outside is -35 degrees celcius which keeps the inside temp at constant 25 degrees

## Homework Equations

## The Attempt at a Solution

Im having trouble finding the Area.

A = 2(pi)rL but when I plug in the radius do I use 2.5m or do I add the 6cm thk insulation to this