Lois is riding in the country. after riding her bike at a constant speed for 4 hours, she finds that she traveled a distance of
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The formula for a circle's area is . We are given an area of 38.465 square inches for a quarter of it.
Multiply this value by 4 to compensate for the quarter circle.
Divide both sides by pi (Note: I'm using the conventional value of 3.14)
Take the positive square root of both sides
The radius is 7 inches. Let me know if you have any questions, thanks!