@sachinch09,
A lot of (Much) trigonometry and geometry goes into (is employed in, is involved with, is entailed in) the interior layout of automobiles (the or an automobile, a car)
A lot of Trignometry & Geometry is used in the interior layout of Automobiles
Now Sach, I'm stretching a point for what little humor it might entail (do you like that word) but the second could be interpreted to mean that the driver and any passengers are in the habit of computation by means of trig and geo as they sit in various spots within the vehicle