please solve it correctly,if it is wrong I will dislike

Let the symmetric object shown in the Figure below be exposed from all sides to a convection environment at a temperature of T and a heat transfer coefficient, h. If the thermal conductivity of the object is k, and the grid size is x=y= : 1. Derive the finite difference equation for node 1. Simplify the equation. 2. Calculate the heat transfer rate by convection to the object, assuming a unit depth of the object