Calculating the diameter of a circle, given the circumference: Eruvin 13b, 14a, 76a-b; Succah 7b
Calculating the square units of a circular area given the square units of a square area of the same diameter, and vice versa: Eruvin 14b, 56b-57a, 76a-b; Succah 8a-b
Calculating the square units of a circle circumscribing, or circumscribed by, a square: Eruvin 76a-b; Succah 8a-b
Calculating the hypotenuse of a square, given the length of a side: Eruvin 57a, 76b; Succah 8a
Rabban Gamliel's use of ratios to determine the height of distant objects: Eruvin 43b