英数题：A circular pool is being built inside a rectangular regi

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英数题：A circular pool is being built inside a rectangular region 12 ft by 18 ft,If the
A circular pool is being built inside a rectangular region 12 ft by 18 ft,If the pool is to be as large as possible,and the edge of the pool must be at least 2 ft from each edge of the rectangle,what is the maximum possible value for the radius of the pool,in feet?
请尽快给我答案和题目的翻译,谢谢哈~·

在12英尺x18英尺的矩形区域内建造一个圆形游泳池,要尽可能地大,而且池边距离矩形的每个边至少要有2英尺,请问游泳池的半径最大是多少英尺?
answer:
r =（12-2-2）/ 2 = 4 (ft）

英数题：A circular pool is being built inside a rectangular regi 英语翻译A rectangular pool is 8m wide and 12m long.A concrete wa school is being built,it is in a m_________. A stellworks is being built .stellwork 为什么加s a new gymnasium is being built in our neighborhood （）A bridge_____last years.A.has been built B.is being built 英语翻译A circular swimming pool has a diameter of 24 ft,the sid In Tim's house,a rectangular swimming pool whose length 30 m she is a real water girl and likes being in the pool. the river ____ ____ a new bridge is being built is 209metres The river on which a new bridge is being built is 209 meters a rectangular game board is composed of identical squares ar