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9. straight line — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHS9. straight line1 Mark
MCQ
The obtuse angle between the lines $y = - \;2$ and $y = x + 2$ is ....$^o$
  • A
    ${120}$
  • ✓
    ${135}$
  • C
    ${150}$
  • D
    ${160}$
✓

Answer

Correct option: B.
${135}$
b
(b) The gradient of the line $y = x + 2$ is $1$. Therefore, it makes an angle of ${45^o}$ with $x$-axis. The second line is parallel to $x$-axis. Hence the obtuse angle between the lines is ${135^o}$.

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