圓錐及扇形英文數學題7(15分)

👨🏻‍🏫 學術台數學

2009-03-11 2:25 am

請依下圖作答,如有需要,請列出所有證明

圖:
http://i167.photobucket.com/albums/u159/karycheung-1994/CIR2.jpg

回答 (1)

2009-03-11 8:21 am

✔ 最佳答案

area = 380 cm2

so, the radius = sqrt [380 / PI()] = 11 cm

surface area = 4 x PI() x (r ^ 2) = 1520 cm2

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