How to find the ratio of diameter and circumference

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ISEE Upper Level Quantitative Reasoning › How to find the ratio of diameter and circumference

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A circle has a radius of . What is the ratio of the diameter to the circumference?

CORRECT

The information about the radius is unnecessary to the problem. The equation of the circumference is:

$C=d\pi$

$\pi \approx 3.14$

Therefore, the circumference is times larger than the diameter, and the ratio of the diameter to the circumference is:

A circle has a radius of . What is the ratio of the diameter to the circumference?

CORRECT

The information about the radius is unnecessary to the problem. The equation of the circumference is:

$C=d\pi$

$\pi \approx 3.14$

Therefore, the circumference is times larger than the diameter, and the ratio of the diameter to the circumference is: