Discussion
If the length of diagonal of a square is 20 cm, then its perimeter is:
Answer: B
The perimeter is 56.56 cm.
The diagonal of a square of side \(a\) is \(a\sqrt{2}\):
\[ \begin{aligned} a &= \frac{20}{\sqrt{2}} = 10\sqrt{2} \approx 14.14\ \text{cm} \\ \text{perimeter} &= 4a \approx 56.56\ \text{cm} \end{aligned} \]
28.28 cm is twice the side, half the perimeter. 141.4 cm is ten times the side, a slip of the decimal point. 40 cm is twice the diagonal, which treats the diagonal as if it were half the perimeter.
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