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SAT官方每日一題：2017年1月9日(SAT數學)

2017/2/27 15:19:48來源：互聯網作者：上海新航道

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摘要：1月9日SAT真題每日一練：本文是sat數學模擬題。上海新航道SAT頻道為大家整理了2017年1月9日SAT官方每日一題，供考生們參考，更多SAT語法備考資料敬請查看上海新航道SAT真題欄目。

1月9日SAT真題每日一練：本文是sat數學模擬題。上海新航道SAT頻道為大家整理了2017年1月9日SAT官方每日一題，供考生們參考，以下是詳細內容。

Read the following SAT test question and then click on a button to select your answer.

In the figure above, O is the center of the circle and triangle ABO is equilateral. If the sides of triangle ABO are of length 6, what is the length of BC?
(A) 3 times square root 3
(B) 4 times square root 3
(C) 6 times square root 3
(D) 9
(E) 12
SAT數學模擬題解析：
Explanation
Choice (C) is correct. Since triangle A B O is equilateral, each of its angles has measure 60°. It follows that angle B O C has measure 120°. Since line O B and line O C are radii of the same circle, they are of equal length, and so triangle O C B is isosceles. Hence angle O B C and angle O C B each have measure 30°. Thus angle A B C has measure 60° + 30° = 90°, and so triangle A B C is a 30 degree - 60 degree - 90 degree right triangle. Since line A B, the side opposite the 30° angle in triangle A B C, is of length 6, it follows that line B C, the side opposite the 60° angle, is of length 6 times square root 3.
更多SAT語法備考資料敬請查看上海新航道SAT真題欄目。