please answer this step by step in clear way I want to under stand every step

1- A dish Stirling system has a peak of solar-telectrical efficiency of =19%, assuming a beam solar radiation equal to 1000[W/m2] and electrical rated power of 12kWe, determine the diameter of the corresponding parabolic collector. 2- a) Find the expression of the focal line F=f(r,D),D is the aperture width of the collector b) if T=45, Determine (F) C- Assuming the rottowing parameters: IG=900[W/m2],Id= 200W/m2=35N, Date = May 27, Solar time =2 p.m, Determine the electrical power can be produced by the above-mentioned disparabolic collector at this Solution 02 A- A( area )=Ibpel0.1912=63.1578m2 How momep foun D( area )=4A=9m, In other words: L=2lbPel=9m B. 1) F=f(r,D)?? tanr=F4F1(D/2)2D/2=2[16F2D2]16DF 16F2tanr8DFD2tanr=0