Output will consist of a single line containing the desired area written as a succession of eight (8) digit fields with two (2) digits after the decimal point.
只有一行输出，将求出的面积按8位数字输出，且小数点后只保留2位（译注：前面不够8位的以空格填充）。
Output will consist of a single line containing the desired area written as a succession of eight (8) digit fields with two (2) digits after the decimal point.
只有一行输出，将求出的面积按8位数字输出，且小数点后只保留2位（译注：前面不够8位的以空格填充）。
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