Updated for
new NCERT
2026-2026.
Get solutions of Chapter 9 Class 11 Straight Lines of the NCERT Book. Answers of all exercise questions, examples and miscellaneous are provided for your reference.
Let's see what this chapter is all about.
We learned about
Coordinate Geometry
in Class 10. In this chapter, we will
-
Revise our
Coordinate Geometry concepts
(Distance between points, Section Formula, Area of triangle) and solve some questions
-
What is
slope of a line
, and different methods to find it (angle, 2 points)
-
Finding
angle
between two lines using slope
-
Checking if
lines are parallel or perpendicular
, using slope
-
Proving
three points collinear
using slope (Slope of AB = Slope of BC)
-
Then, we study
equation of lines
-
Equation of lines
parallel to x and y axis
-
Slope of lines parallel to x and y axis
-
Equation of line when
1 point and slope
is given
-
Equation of line when
2 points
are given
-
Equation of line when
slope and intercept
is given(both x intercept and y intercept)
-
Equation of line when both x and y intercepts are given (Equation of line in
intercept form
)
-
Equation of line in
normal form
-
General Equation
of line, and converting any equation into General Form
-
Finding
Distance of a point from the line
-
Finding
Distance between two parallel
lines
-
Distance of a point from a line
along a line
-
Mix
Questions using all the concepts
You can check out the solutions by clicking the exercise links below, or learn the concepts (with questions), the NCERT way.