# Aptitude - Volume and Surface Area - Discussion

Discussion Forum : Volume and Surface Area - General Questions (Q.No. 13)
13.
What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
344.35 cm2
462 cm2
498.35 cm2
None of these
Explanation:

h = 14 cm, r = 7 cm.

So, l = (7)2 + (14)2 = 245 = 75 cm.

Total surface area = rl + r2
 = 22 x 7 x 75 + 22 x 7 x 7 cm2 7 7
= [154(5 + 1)] cm2
= (154 x 3.236) cm2
= 498.35 cm2.

Discussion:
11 comments Page 1 of 2.

Sachin K C said:   3 years ago
l is the slant height of the cone
Formula to find slant height of the cone is √(r^2+h^2).

Diwa said:   4 years ago
How to find √5 value?
(2)

Shital said:   6 years ago

Rajak said:   6 years ago
49*5=245.
49 out of root is 7.

D Priya said:   7 years ago
To find square roots use long division method.

Gayathri said:   7 years ago

Hrushi said:   7 years ago
How calculate root of 245? Please tell me.

Nishanth said:   7 years ago
How the area of the sector is π*r*l?

Sami said:   7 years ago
I need a proper explanation. Please anyone explain it.

Abinaya said:   7 years ago