{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cspan\u003e\u003cspan\u003e一个杯子装了很多水,可以把\u003c/span\u003e杯子看成圆台,\u003c/span\u003e并给出圆台的底面半径,顶部半径,高还有水的体积,求水的高度。\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cspan\u003e\u003cspan\u003e输入包括T组数据\u003c/span\u003e\u003c/span\u003e\n \u003cbr\u003e \n \u003cspan\u003e\u003cspan\u003e每组数据包含一行,并且有\u003c/span\u003e四个数r\u003c/span\u003e, R, H, V代表圆台底部半径,顶部半径,高度和水的体积。\n \u003cbr\u003e \n \u003cbr\u003e 1. T ≤ 20.\n \u003cbr\u003e 2. 1 ≤ r, R, H ≤ 100; 0 ≤ V ≤ 1000,000,000.\n \u003cbr\u003e 3. r ≤ R.\n \u003cbr\u003e 4. r, R, H, V \n \u003cspan\u003e\u003cspan\u003e输入\u003c/span\u003e\u003c/span\u003e\n \u003cbr\u003e 5. \n \u003cspan\u003e\u003cspan\u003e无空数据\u003c/span\u003e\u003c/span\u003e\n\u003c/div\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e \u003cspan\u003e答案为一行,\u003cspan\u003e保留6位小数\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cpre\u003e\r\n\t\u003c/pre\u003e \n \u003cdiv\u003e \n \u003cpre\u003e\r\n\t\t1\r\n100 100 100 3141562 \u003c/pre\u003e \n \u003c/div\u003e \n\u003c/div\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cdiv\u003e \n \u003cpre\u003e\r\n\t\u003c/pre\u003e \n \u003cdiv\u003e \n \u003cpre\u003e\r\n\t\t99.999024 \u003c/pre\u003e \n \u003c/div\u003e \n\u003c/div\u003e"}}]}