Using John Wallis’s equation for Pi, continue the series for a total of 30 fractions and estimate π. Compare the answer with π given at the start of the chapter.
Gabriel’s Horn x y =
1 x
0·2 5
1 1
y
1 2 3 4 5
1 2 3 4 5 6 7 8 9 10 x
This graph can be turned into a 3D shape by rotating it 360°, a full circle, on the x-axis. This produces a shape like a horn.
2 0·5 3 0·33
Draw a graph of the function f (x) = for values of x between 1 and 10 inclusive. f (x) is plotted below to 2 decimal places.