Hello all,
數學題我不知道要怎樣把圖給畫出來...不過題目如下;
107. In the figure above, equilateral triangle ABC is inscribed in the circle. If the length of arc ABC is 24, what is the approximate diameter of the circle?
(A) 5
(B) 8
(C) 11
(D) 15
(E) 19
Answer is C
有人做過這題嗎? 我怎麼看11都是半徑而已, 怎會是直徑勒???
24 = (1/3) x 2*pi*r ==> r = 36 / pi which is close to 11....
請大家幫幫愚笨的小弟....thanks.