Question

Two circles have a diameter in the ratio 1:3 find the ratio of the circumference with equation

Answer 1

This is true because you are taking the two diameters and multiplying them by the identical number. This means the proportions will remain the same. For example, if the diameters really were 1 and 3, the circumferences would be 3.14 (1*3.14 because pi = 3.14) and 9.42 (3*3.14). The ratio of these numbers is 1:3.