Thecircumferenceofacircleisdirectlyproportionaltothelengthofitsradius,anditsareaisdirectlyproportion
问题描述：
The circumference of a circle is directly proportional to the length of its radius,and its area is directly proportional to the square of the length of its radius.If the circumference of a circle is multiplied by 6,then its area is multiplied by ________需要翻译及解答
最佳答案： 圆的周长与半径成比例,圆的面积与半径的平方成比例.如果周长扩大6倍,它的面积扩大多少倍?答：36倍
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