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The slope of a line whose inclination is ninety degrees is:
ANot defined
BEqual to one
CEqual to two
DEqual to zero
Answer & Solution
Correct answer: A. Not defined
1. Slope is the tangent of the inclination.
2. The tangent of ninety degrees has no finite value.
3. So the slope of such a line is not defined.
_Source: NCERT Class 11 Mathematics, Chapter 10, Straight Lines._
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