1.5/4 is shaded, since there is one block shaded, and half of another block (1.5)
I don’t know if you meant 7 hours or 7 1/2 hours, but if it was in 7 hours, the answer would be around 15 square feet. If it was 7 1/2 hours, it would be 14 square feet.
Sin 0 sin 3pi/2 and tan pi
cos pi/2 is -.5
cos 0 is 1
25.2:360 ::x:5100
Or 25.2 x ------=----- then cross multiply, 360x=5100*25.2