(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
form 3 .Mathes **Urgent**
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 ,
(a) the radius of the cone ,
回答 (1)
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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