Problem $05\mathrm{.}066-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS

Consider steady two$-$dimensional heat transfer in a long solid body whose cross section is given in the figure. The measured temperatures at selected points of the outer surfaces are as shown. The thermal conductivity of the body is $k=45\frac{W}{m}*K,$ and there is no heat generation. Take the finite difference method with a mesh size of $x=y=2\mathrm{.}0cm.$

Problem $05\mathrm{.}066.$b $-$ Nodal temperatures inside $2$D long solid body

What are the temperatures at Node $3$ and Node $4?$

Node $3$: $C$

Node $4$: $C$