Consider a rectangular fin with a length of $20$ mm$,$ a width of $10$ mm and a thickness of $6$ mm$.$ The ambient surroundings have a temperature of $25$ deg C with a convection coefficient of $75$ W$/$m$2$ K$.$ The material is AISI $302$ stainless steel and the temperature of the base is $250$ deg C$.$ Using Figure $3-43($Efficiency of straight fins graph$)$a$.$ determine the efficiency of the rectangular finb. determine the fin heat transfer ratec. determine the heat transfer from the wall at the base of the fin that would occur if no fin were presentd. determine the effectiveness of the triangular fine. is this an effective fin? Why?Complete all of the above calculations for a triangular fin and compare the results