[中學] AMC10 2007 圓
http://ppt.cc/JCLK
四個半徑是1的圓分別與正方形的兩邊相切且與一個半徑是2的圓外切
求正方形面積
Four circles of radius 1 are each tangent to two sides of a square
and externally tangent to a circle of radius 2, as shown.
What is the area of the square?
想請問解答說 三角形OAB是直角三角形
想請問為什麼OAB是直角三角形?
直角是怎麼推得的
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