note that :
cot150 = 1/tan150
cos390 = cos(360+30) = cos30
Answer:
Your bicycle has 22 gears.
Step-by-step explanation:
The number of gears in the bycicle is the number of combinatiors of a front sprocket and a rear sprocket.
For each front sprocket, there are 11 rear sprockets. There are 2 front sprocts.
So, the number of gears that your bicycle has is
2*11 = 22.
C = 2pi*r
Plug in the circumference
6.28 = 2*pi*r
3.14 = pi *r
plug in pi
3.14 = 3.14 * r
r = 1