Chapter 10 Straight Lines
In earlier classes, you have read about lines in the Euclid geometry section. That is just an introduction but now we go in depth of lines and its various aspects. Concepts of lines are very essential to know about conics and 2d3d geometry, which we will discuss later. This chapter consists of basics of 2d geometry, shifting of origin, slope of line, angle between two lines, various forms of equation of line point  slope form slope intercept form, two points form, intercept form, normal form, etc., general equation of line, distance of a point from a line, equation of family of lines.
Download pdf of NCERT Solutions for Class Mathematics Chapter 10 Straight Lines
Download pdf of NCERT Examplar with Solutions for Class Mathematics Chapter 10 Straight Lines
Exercise 1

Q1 
Draw a quadrilateral in the Cartesian plane, whose vertices are (– 4, 5), (0, 7), (5, – 5) and (– 4, –2). Also, find its area. 
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Q2 
The base of an equilateral triangle with side 2a lies along the yaxis such that the midpoint of the base is at the origin. Find vertices of the triangle. 
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Q3 
Find the distance between P (x1, y1) and Q (x2, y2) when : (i) PQ is parallel to the yaxis, (ii) PQ is parallel to the xaxis. 
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Q4 
Find a point on the xaxis, which is equidistant from the points (7, 6) and (3, 4). 
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Q5 
Find the slope of a line, which passes through the origin, and the midpoint of the line segment joining the points P (0, – 4) and B (8, 0). 
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