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The area of a circle is pi multiplied by "'r' (radius) squared"

"r" is 2.5 (half of the diameter)

"r squared" is 2.5*2.5 which is 6.25.

In terms of pi, the area of the specified circle is 6.25[pi] units squared

Pi's rounded answer is 3.14. So in an answer not in terms of pi, you would multiply 6.25 and 3.14. That equals 19.625 units squared

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