osthenes estimated the circumference of the Earth as 250 000 stadia (the length of an athletic stadium). If we assume he used the most common length of stadia of his time, his estimate of the circumference of the Earth would be 46620 km. Currently, the accepted average circumference of the Earth is 40030.2 km. Find the percentage error of Eratosthenes' estimate of the circumference of the Earth. a Calculate the actual and an approximate temperature in C, using the standard formula and Tommaso's grandmother's rule. b Calculate the percentage error of the approximate temper