Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 1)
1.
A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:
12
cm3
cm315 cm3
cm316 cm3
cm320 cm3
cm3Answer: Option
Explanation:
Clearly, we have r = 3 cm and h = 4 cm.
 Volume = |
1 | r2h = |
 |
1 | x x 32 x 4 |
 cm3 |
= 12 cm3. |
| 3 | 3 |
Video Explanation: https://youtu.be/Njsid2mVwUY
Discussion:
77 comments Page 2 of 8.
Mohit kumar chaudhary said:
7 years ago
I am not getting the answer. Please explain to me.
(2)
Durga said:
7 years ago
Could you please explain it in clear?
Shubhsm said:
7 years ago
How deside 3 cm are base?
Red Anca said:
7 years ago
I think the h=3 due to the problem rotated about 3cm..and the base or raduis will be r=4cm,
We can redirect to the formula;
V=1/3 * 3.141592654 * r'2 * h,
V=1/3 * 3.141592654 * 4'2 * 3.
V = 50.26 cm'3.
We can redirect to the formula;
V=1/3 * 3.141592654 * r'2 * h,
V=1/3 * 3.141592654 * 4'2 * 3.
V = 50.26 cm'3.
Tanisha jha said:
7 years ago
I can't understand please help me to understand it.
D Priya said:
8 years ago
A cone can be rotated and formed from a triangle by considering the base. Rotate the 4cm angle to the base and proceed.
Sam singh said:
8 years ago
If we rotate the angle from side of 4 cm thn what will be perpendicular?
DEV RAJ said:
8 years ago
Right triangle is rotated on the axis at 90*, the side of 3 cm is rotated along the axis so diameter is 6 and are = 3.
It is given, if we are rotating on the side 3cm it must be base "see the diagram".
It is given, if we are rotating on the side 3cm it must be base "see the diagram".
Gopi said:
8 years ago
If base radius of a cone is increased by 20% and its slant height is made double then by how much percent will the area of its curved surface be increased?
a) 140% b) 110% c) 120% d) 130%
a) 140% b) 110% c) 120% d) 130%
Annu said:
8 years ago
I didn't understand this. Please explain me.
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