form 3 .Mathes Urgent

👨🏻‍🏫 學術台數學

Tsz Ching

2010-02-12 2:43 pm

The slant height of a right circular cone is 6 cm.If the total surface area of the cone is 51.84cm^2 ,find
(a) the radius of the cone ,

更新1:

The answer =4.8 cm... How to calculate...???????????

更新2:

total surface is 51.84pi

回答 (1)

用戶10012

2010-02-12 3:19 pm

✔ 最佳答案

Assumed it is a solid cone.
Total surface area A = pr^2 + prl where p = pi.
Now A = 51.84.
l = 6
p = 3.14
so 51.84 = 3.14r^2 + (3.14)(6)r
3.14r^2 + 18.84r - 51.84 = 0
r = 2.05 cm.

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form 3 .Mathes Urgent