Discussion
If the surface area of cube is 486 cm2, then its volume in cm3 will be?
Answer: A
The volume is 729 cm3.
A cube has six square faces, so its surface area is \(6a^{2}\):
\[ \begin{aligned} 6a^{2} &= 486 \\ a^{2} &= 81 \Rightarrow a = 9\ \text{cm} \\ V &= a^{3} = 9^{3} = 729\ \text{cm}^{3} \end{aligned} \]
625 is \(25^{2}\), 216 is \(6^{3}\) and 743 is not a cube at all; none comes from an edge of 9 cm.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development