# Answer to Question #9063 in MatLAB | Mathematica | MathCAD | Maple for sara

Question #9063

3. With considering the following algorithm for computing pi:

I. Set a = 1, b = 1/sqrt(2), t = 1/4 and x = 1

II. Repeat the following commands until the difference between a and b is within some desired accuracy:

y = a

a = (a + b)/2

b = sqrt(b*y)

t = t - x*(y - a)^2

x = 2*x

III. From the resulting values of a, b and t, an estimate of pi is

Pi_est = ((a + b)^2)/(4*t)

How many repeats are needed to estimate pi to an accuracy of 1e-8? 1e-15?

I. Set a = 1, b = 1/sqrt(2), t = 1/4 and x = 1

II. Repeat the following commands until the difference between a and b is within some desired accuracy:

y = a

a = (a + b)/2

b = sqrt(b*y)

t = t - x*(y - a)^2

x = 2*x

III. From the resulting values of a, b and t, an estimate of pi is

Pi_est = ((a + b)^2)/(4*t)

How many repeats are needed to estimate pi to an accuracy of 1e-8? 1e-15?

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