標題:
最佳回答取４０分：幾條關於volume of cirxular cone既問題=)
發問:
以下有兩條問題想請教下圖片參考：http://i225.photobucket.com/albums/dd54/icon_2kf/00015.gif第一條：A piece of ice in form of an inverted right circular cone has radius of 4.5 cm and slant height 3 cm as shown below is resulted. Find the volume of the frustum correct to 3 significant... 顯示更多 以下有兩條問題想請教下 圖片參考：http://i225.photobucket.com/albums/dd54/icon_2kf/00015.gif 第一條： A piece of ice in form of an inverted right circular cone has radius of 4.5 cm and slant height 3 cm as shown below is resulted. Find the volume of the frustum correct to 3 significant figures. 圖片參考：http://i149.photobucket.com/albums/s72/zivsinglung/SSL10816.jpg 第二條： Figure (a) below shows a solid right circular cone. O is the vertex and Pis a point on the circumference of the base. The area of the curved surface area 135πc㎡ and the radius of the base is 9 cm. Figure (a): 圖片參考：http://i149.photobucket.com/albums/s72/zivsinglung/SSL10819.jpg (a) Find the length of OP. (b) Find the height of the cone. Figure (b): 圖片參考：http://i149.photobucket.com/albums/s72/zivsinglung/SSL10820.jpg (c) The cone in Figure (a) is cut into two portion by a plane parallel to its base. The upper portion is a cone of the base radius 3 cm. The lower portion is a frustum of height x cm. (i) Find the value of x. (ii)A right cylindrical hole of radius 3 cm is drilled through the frustum, see Figure (b). Find the volume of the solid remained in the frustum. 希望大家幫下手啦 圖片參考：http://i225.photobucket.com/albums/dd54/icon_2kf/00015.gif
此文章來自奇摩知識+如有不便請留言告知
最佳解答:
Q1 要find 個cone 的ratio of height & radius find smaller radius then vol of cone with radius4.5- vol of cone with smaller radius Q2a OP (r)(pie)=135pie OP=15 2b height(square)=15x15-9x9=144 height=12 2ci 3/9 = (12-x)/12 4=12-x x=8 2cii 9(12)(9)pie/3- 3(3)(12-8)pie/3 -3(3)(8)pie=(324-12-78)pie=234pie cm2
其他解答:4E350C6F8B48ECA2
留言列表
