The thing that i understood most about chapter seven is the word problems. it has three formulas that can be used.

1. s=r x theta
2. k= 1/2 r^2 x theta
3. k= 1/2rs

some of the word problem hints is:
theta = apparent size
s= diameter of an object
r= distance between the objects

example 1:

A sector of a circle has a radius of 7cm and central angle of 50 degrees. find its approxiomate arc length and area.
r= 7cm theta=50 degrees
s=? k=?

then plug into a formula:
s=(7)(50)
s= 350 degrees

then plug that into a formula to find k.
k=1/2(7)(350)
k= 1225cm