Answer:
Sometimes . The diameter is used in the formula.
Tricky. see explanation. The units are always squared.
√ The area can be found when given the diameter by first finding the radius.
NO! The area is the distance around the circle.
√ if you think about it. Circumference can be used to find area.
Explanation:
Sometimes the formula is given A=π(d/2)² . Same as A = πr²
The Area will be expressed in "units squared" Pi is not a square unit. Radius, diameter and circumference are linear units not square units. So which units does this (vague, tricky) question mean?
If you are given a circumference and divide by Pi, you get the diameter. You can take half the diameter to get a radius. Square that radius and multiply by Pi to get the Area.