Final answer:
The radius (r) of a circle with the diameter of ⅑ (⅔) is equal to ⅔, because the radius is half of the diameter.
Step-by-step explanation:
The radius r of a circle is defined as half of its diameter. Hence, if a circle has a diameter of ⅑ (which is ⅔), the radius r would be half of this diameter. Given the diameter, to find the radius, you simply divide the diameter by two:
r = Diameter ÷ 2
Therefore, the radius for a circle with a diameter of ⅑ is:
r = ⅑ ÷ 2
r = ⅔ ÷ 2
r = ⅔