ACT MATH · Plane Geometry · Standard
Plane Geometry: A circle's circumference is math. Find its area.
Polygons, Pythagorean theorem, circles.
Try the problem
A circle's circumference is . Find its area.
Hint and answer
Concept to use
$a^2+b^2=c^2$.
Hint
Find the radius first.
Answer
81π
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