GWD4-8

[Martina]

Q8
A cash register in a certain clothing store is the same distance from two dressing rooms in the store. If the distance between the two dressing rooms is 6 feet, which of the following could be the distance between the cash register and either dressing room ?
I. 6 feet
II. 12 feet
III. 24 feet

A. I only
B. II only
C. III only
D. I and II
E. II and III

ANS: E

好像算不出來ㄝ 不知道有沒有什麼公式呢 ?

[liwuu]

我覺得答案是三個都可以...
利用三角形來看
第一個是正三角形
另兩個分別為腰為12,24 feet的等腰三角形...再看看囉!!

[bugubugu]

你這好像不是gwd4-q8耶...
同學你再確認一下你的題號...
不然不知如何編到連結那邊....
謝謝!

[blue123736]

這題是天山4-Q8啦

題目應該是

A cash register in a certain clothing store is the same distance from two dressing rooms in the store. If the distance between the two dressing rooms is 16 feet, which of the following could be the distance between the cash register and either dressing room ?
I. 6 feet
II. 12 feet
III. 24 feet

A. I only
B. II only
C. III only
D. I and II
E. II and III

ANS: E

用三角形兩邊之和一定大於第三邊
兩邊之差一定小於第三邊
的定理可以得出
I不行 II III可以
所以是E

[chris8888]

the distance between the cash register and either dressing room <== 這可以決定一個點, 位於room1, room2, cash register的中間.
劃個圖你會發現, 他在這三個位置的中間, 假設這個點的距離三個物體是x
x + x > 16 => 2x > 16 => x > 8 (三角形兩邊合大於第三邊的條件)
II and III