Скачать или смотреть Lines & Angles | NCERT Exemplar Ex 6.3 | Class 9 Maths

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In geometry, a line is a set of points with length but no width. An angle is formed when two rays meet at a common point called the vertex. 

Here are some properties of lines: 

Lines are a set of an infinite number of points that are close together.

They extend infinitely in both directions.

They are one-dimensional and have no depth or thickness.

Here are some types of angles: 

Acute angle: An angle that measures between 0° and 90°.

Obtuse angle: An angle that measures between 90° and 180°.

Right angle: An angle that is exactly equal to 90°.

Straight angle: An angle that is exactly equal to 180°.

Here are some formulas for lines and angles: 

When two lines intersect at a point, they form two vertically opposite angles that are equal to each other.

Two angles are complementary to each other if their sum is 90 degrees.

Here are some types of lines: Perpendicular lines, Intersecting lines, Transversal lines. 

Here are some types of angles: Alternate angles, Corresponding angles.