Urgent Question(6) ^_^

👨🏻‍🏫 學術台數學

用戶85377

2007-08-15 3:52 am

Please show the steps very clearly.
1. A solid sphere with radius r is cut into two equal parts. What is the increase in the total surface area?
2. Two ice-creams have similar shapes. Each of them has a shape of a hemisphere on top of a cone. The amall ice-cream has 70ml of ice-cream. The large ice-cream has double the surface area of the smaller one. Find the volume of the large ice-cream. (Give the answer correct to the nearest ml.)

更新1:

1. ??????

回答 (1)

STEVIE-G™

2007-08-15 4:43 am

✔ 最佳答案

1.
the original total surface area
=4πr2
the new total surface area
=4πr2+2(πr2)
=6πr2
therefore,the increase in the total surface area=2πr2
=============================================================

2.
The large ice-cream has double the surface area of the smaller one
that means the ratio of the volume of large one and small one is 1:2√2
the volume of the large ice-cream
=70(2√2)
=198ml

👍 0 👎 0

收錄日期: 2021-04-25 17:18:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070814000051KK05044

檢視 Wayback Machine 備份