题目信息
An architect is planning to incorporate several stone spheres of different sizes into the landscaping of a public park, and workers who will be applying a finish to the exterior of the spheres need to know the surface area of each sphere. The finishing process costs $92 per square meter. The surface area of a sphere is equal to $$4\pi{r^2}$$Rwhere r is the radius of the sphere.

In the table, select the value that is closest to the cost of finishing a sphere with a 5.50-meter circumference as well as the cost of finishing a sphere with a 7.85-meter circumference. Make only two selections, one in each column.
Circumference 5.50m
Circumference 7.85m
$900
$1200
$1800
$2800
$3200
$4500
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正确答案: Circumference 5.50m:$900; Circumference 7.85m:$1800;
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