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Ex 9.1, 7 - Chapter 9 Class 11 Straight Lines
Last updated at Dec. 16, 2024 by Teachoo
Chapter 9 Class 11 Straight Lines
Concept wise
- Cordinate geometry questions
-
Slope - Finding slope
- Slope - Prependicularity
- Angle between two lines by Slope
- Collinearity of 3 points by sliope
- Point Slope form
- Slope-Intercept form
- Intercept form
- Normal form
- Given Statement
- Two lines // or/and prependicular
- Angle between two lines
- Distance - Between two parallel lines
- Distance of a point from a line
- Distance of a point from a line along a line
- Other Type of questions - Area of Triangle formed
- Other Type of questions - 3 lines Concurrent
- Other Type of questions - Image
- Other Type of questions - Mix
Transcript
Ex 9.1, 7 Find the slope of the line, which makes an angle of 30° with the positive direction of y-axis measured anticlockwise. The line makes angle of 30° from positive y axis Hence it makes angle of (90° + 30°) from positive x axis i.e. 120° from positive x axis Hence θ = 120° Slope = m = tan θ = tan 120° = tan (180 – 60°) = –tan 60° = –√3 Hence, Slope of line = –√𝟑 (tan(180° – 𝜃) = –tan 𝜃)
