In a geometric argument (see figure) was used to prove the following.
limitθ→0 sin(θ)/θ= 1
![493_Geometric argument.jpg](https://secure.tutorsglobe.com/CMSImages/493_Geometric%20argument.jpg)
a. Write the area of ΔABD in terms of θ.
b. Write the area of the shaded region in terms of θ.
c. Write the ratio R of the area of ΔABD to that of the shaded region.
d. Find the following limit.
limitθ→0 R.