[問題] GWD 30-28

[misia]

Q 28:

In the retangular coordinate system, points (4,0) and (-4, 0) both lie on circle C. What is the maximum possible value of the radius of C ?

A. 2
B. 4
C. 6
D. 16
E. There is no finite maximum value

答案E,
大家知道怎麼解嗎 ?

[eiswein]

Q 28:

In the retangular coordinate system, points (4,0) and (-4, 0) both lie on circle C. What is the maximum possible value of the radius of C ?

A. 2
B. 4
C. 6
D. 16
E. There is no finite maximum value

答案E,
大家知道怎麼解嗎 ?

呃....這個嘛....
最小的半徑就是圓心在原點的時候，也就是半徑是4
最大的半徑的話，就沒有一個固定的數字...
我不會畫圖表示耶

糟糕...有回答跟沒回答一樣.......