CBSE BoardEnglish MediumSTD 11 ScienceMathsStraight Lines1 Mark
MCQ
The distance between the points $(a, b)$ and $(-1, -b)$ is:
A
$0$
B
$1$
C
$\sqrt{\text{ab}}$
✓
None of the above
✓
Answer
Correct option: D.
None of the above
Distance between two points $({\text{x}_{1, }}{\text{y}_{1}})$ and $({\text{x}_{2, }}{\text{y}_{2}})$ can be calculated using the formula
$\sqrt{{(\text{x}_{2}-\text{x}_{1})}^2+{(\text{y}_{2}-\text{y}_{1})}^2}$
Distance between the points $(a, b)$ and $(-1, -b)$
$(-1-\text{a})^2+(\text{b - b})^2 = \sqrt{1+\text{a}^2+2\text{b}+4\text{b}^2}$
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