Answer:
The measurement used is "mm²"
Depending on the options provided, here are some answers in decreasing accuracy
16π mm² ; 50.26548 mm² ; 50.24 mm²
Explanation:
To find the area of a circle, you'd use the equation:
A=πr²
And since you have been given a diameter:
d=2r
.: A=π(d/2)²
For the area, you take the unit provided and square it (eg cm to cm²) or just do u² if no units are provided. In your case, it is mm to mm²
All together, we can just replace the variable used with numbers to fill in:
A=π(8/2)²
.:A=π4²
.:A=16π mm²
Lastly, based on how your question is worded, the answer was either the measurement given or you need to simplify.
The measurement would be mm²
If π is typed into a calculator:
A= 50.265482...
If π≈3.14
A= 50.24
I'm also guessing this is multiple choice it is asking for the closest answer, in which case I have listed them in decreasing accuracy above.