NCERT Solutions: Chapter - 6 - Lines and Angles, Class 9, Mathematics

# Chapter - 6 - Lines and Angles, Class 9, Mathematics NCERT Solutions - Extra Documents & Tests for Class 9

## Extra Documents & Tests for Class 9

1 videos|228 docs|21 tests

## FAQs on Chapter - 6 - Lines and Angles, Class 9, Mathematics NCERT Solutions - Extra Documents & Tests for Class 9

 1. What are lines and angles?
Ans. Lines and angles are fundamental concepts in geometry. A line is a straight path that extends infinitely in both directions. It has no endpoints. An angle is formed when two lines meet at a point called the vertex. It is measured in degrees.
 2. What is the difference between a line segment and a line?
Ans. A line segment is a part of a line that has two endpoints. It is a finite length. On the other hand, a line extends infinitely in both directions and has no endpoints. It is an infinite length.
 3. What are the types of angles based on their measurements?
Ans. Angles can be classified into different types based on their measurements. Some common types include: - Acute angle: An angle that measures less than 90 degrees. - Right angle: An angle that measures exactly 90 degrees. - Obtuse angle: An angle that measures more than 90 degrees but less than 180 degrees. - Straight angle: An angle that measures exactly 180 degrees. - Reflex angle: An angle that measures more than 180 degrees but less than 360 degrees.
 4. How can we identify parallel lines and transversals?
Ans. Parallel lines are two or more lines that never intersect. They always maintain the same distance between each other. Transversals are lines that intersect two or more parallel lines. To identify parallel lines and transversals, you can look for pairs of corresponding angles. If the corresponding angles are equal, then the lines are parallel. Additionally, if the alternate interior angles or alternate exterior angles are equal, then the lines are also parallel.
 5. What is the sum of angles in a triangle?
Ans. The sum of angles in a triangle is always 180 degrees. This property is known as the Angle Sum Property of a Triangle. It holds true for all types of triangles, whether they are equilateral, isosceles, or scalene.

## Extra Documents & Tests for Class 9

1 videos|228 docs|21 tests

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