2015年11月12日SAT官方每日一題

2015/11/12 瀏覽次數:3 收藏
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  標題範例:Mathematics > Standard Multiple Choice

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

  A right circular cylinder has height 6 and volume 54π. What is the circumference of its base?

  (A) 2π

  (B) 3π

  (C) 6π

  (D) 9π

  (E) 18π

  謎底:C

  【剖析】The volume of a cylinder with radius r and height h is equal to πr²h. Therefore,πr²(6)=54π and r²=9 , so the radius of the cylinder is 3. The circumference of a circle with radius r is equal to 2πr; therefore, the circumference of the base is equal to 6π.