What formula calculates the area of a circle given its radius?
A basic geometry question testing knowledge of standard formulas. It checks attention to detail and unit handling.
Why Interviewers Ask This
While simple, this question verifies that candidates remember fundamental formulas and can implement them accurately. It also tests if they handle floating-point arithmetic correctly and define constants like PI appropriately.
How to Answer This Question
State the formula Area = π * r². Explain the need to use a precise value for Pi. Mention handling invalid inputs like negative radii. Discuss data types for floating-point results.
Key Points to Cover
- Standard formula
- Constant for Pi
- Input validation
- Floating-point precision
Sample Answer
The area of a circle is calculated using the formula A = π * r², where r is the radius. I would use a precise constant for Pi, such as Math.PI in Java or Python. Before calculating, I should validate that the radius is n…
Common Mistakes to Avoid
- Using approximate Pi value
- Ignoring negative radius input
- Integer division errors
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