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ZX-BB102527B82024年12月北美A卷 · 第 14 题
2024年12月北美A卷 · 原库模块 2 · Q14 原库参考解析
\( c(r)=\frac{2}{5}(2πr) \)
The function c gives the partial length, in centimeters (cm), of the circumference of a circle with a radius that measures r cm. According to the function, for each increase of 18 cm in the length of the radius, this partial length of the circumference increases by kπ cm. What is the value of k?
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