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Ex 9.1, 3 (i) - Chapter 9 Class 11 Straight Lines
Last updated at August 8, 2026 by Teachoo
Cordinate geometry questions
Chapter 9 Class 11 Straight Lines
Concept wise
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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
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Transcript
Ex 9.1, 3 Find the distance between P (x1, y1) and Q (x2, y2) when: (i) PQ is parallel to the y-axis. Since PQ is parallel to y-axis x1 = x2. Distance PQ = ā("(" š„_2āš„_1 ")2 " +"(" š¦_2āš¦_1 ")2" ) = ā("(" š„_2āš„_2 ")2 " +"(" š¦_2āš¦_1 "2" ) = ā((š¦_2āš¦_1 "2" )+0) = ā("(" š¦_2āš¦_1 ")2" ) = Ā± (š¦_2āš¦_1) = |"y2" ā"y1" |
