trig
posted by ahnas on .
A pendulum is 18 feet long. Its central angle is 44º. The pendulum makes one back and forth swing every 12 seconds. Each minute, the pendulum swings _____ feet. (Answer to the nearest foot.)

s = rθ = 18(44*pi/180) = 13.82ft in one arc
It makes 10 (5 back and forth) swings every minute.
Total travel: 138 ft 
s=rØ r=18 Ø= (11π/45) radians
s=18(11π/45)
s≈13.82 ft/sec
60sec÷12sec= 5sec
5×2=10
10×13.82=138.2
The pendulum travels 138 feet each minute
Degrees to radians;
(44÷1) × (π÷180) = (11π÷45)