Lines parallel to the x-axis have an inclination of:
AZero degrees
BNine degrees
CSixty degrees
DNinety degrees
Answer & Solution
Correct answer: A. Zero degrees
1. A horizontal line never rises above its starting height.
2. The angle it makes with the x-axis is therefore nothing at all.
3. Lines parallel to the x-axis have inclination of zero degrees.
4. So their slope is zero.
_Source: NCERT Class XI Mathematics, Ch 9 'Straight Lines'_
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