For which inclination is the slope of a line not defined?
ANinety degrees
BNineteen degrees
CSixty degrees
DSixteen degrees
Answer & Solution
Correct answer: A. Ninety degrees
1. Slope is the tangent of the inclination.
2. The tangent has no value at one particular angle in the range.
3. The slope of a line whose inclination is ninety degrees is not defined.
4. That is why vertical lines have no slope.
_Source: NCERT Class XI Mathematics, Ch 9 'Straight Lines'_
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