Katy finds the area under a sine wave from 0 to Pi
(She used the same method that Archimedes used to find the area of a parabolic segment, which she saw in Don's worksheet book).
Note: Katy got an approximation of 1.9742 . The exact answer is 2, and Katy was off by only about 3/200 =1.5% !
Great job Katy!!!
Don's proof: = -Cos[x]] = -Cos[p]-(-Cos) = 1+1 =2