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Inclination of a Line

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CISCE: Class 10

Definition: Inclination of a Line

The angle of inclination, or simply the inclination of a line, is the angle θ that the part of the line above the x-axis makes with the positive direction of the x-axis and is measured in an anticlockwise direction.

  • Anticlockwise → Positive inclination

  • Clockwise → Negative inclination

CISCE: Class 10

Key Points: Inclination of a Line

Standard Results

  • x-axis / parallel to x-axis → θ = 0

  • y-axis / parallel to y-axis → θ=90

Line Types

  • Horizontal line → parallel to x-axis

  • Vertical line → parallel to y-axis

  • Oblique line → neither parallel to the x-axis nor the y-axis

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