## NCERT Solutions for Class 9 Maths Chapter 6 Lines and Angles (Ex 6.2) Exercise 6.2

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Q 1: Give an overview of the chapter Lines and angles.

Ans: Here, you will come across definitions and basic terms related to a line segment, collinear points, intersecting lines, ray, non collinear points and non intersecting lines. You shall also know about various pairs of angles such as linear pair of angles, the reflex angle, vertical opposite angle, complementary angle, adjacent angle and supplementary angles.

The chapter also gives you an idea of transversal and parallel lines with the help of the theorems to support over it. Here, the chapter also focuses upon of angle sum property of a triangle.

Q 2: What is the chapter mainly focused on?

Ans: The chapter mainly deals with:

Points

Line segments

Ray

Collinear points

Non collinear points,

Intersecting lines

Concurrent lines

Plane

Right angle

Acute angle

Obtuse angle

Straight angle

Reflex angle

Complete angle

Equal angle

Vertically opposite angle

Bisector of an angle

Parallel lines

Adjacent angles

Linear pair of angles

Transversal of the lines

The angles that a transversal forms

interior angles that stay on the same side of the transversal

corresponding angles

Consecutive interior angles

Alternate interior angles

Scalene triangle

Isosceles triangle

Equilateral triangle

Acute triangle

Right triangle

Obtuse triangle

Regular polygon

Supplementary angles

Complementary angles

Parallel lines theorems

Converse of theorems

Triangle theorems

Q 3: What is a parallelogram triangle?

Ans: Inverse sides of a parallelogram are always parallel (by definition) and because of which they will never intersect. The area of a parallelogram is twice the area of a triangle designed by one of its diagonal sides. The area of a parallelogram is also considered to be equal to the magnitude of the vector across the product of two adjoining sides.

**Rhomboid –**It is a quadrilateral whose opposite sides are adjacent and parallel sides are dissimilar, and whose angles are not always right angles.**Rectangle –**It is a parallelogram along with four angles of equal size (i.e., right angles).**Rhombus –**It is a parallelogram which consists of four sides with equal lengths.**Square –**It is a parallelogram with four sides of same and equal length and angles of identical and equal size (right angles).

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