Class 9th Lines and Angles & Transversal Line

Line: line is a one-dimensional, straight, and continuous path of points that extends infinitely in both opposite directions, having length but no width or thickness.

Line Segment: A part or portion of a line with two end points.

Ray: part of a line with one end point.

Collinear points: Three or more points lying on the same line.

Non-Collinear Points: Three or more points which do not lie on same line.

Angle: An angle is formed when two rays originate from the same end point. The rays making angle are called the arms and the end point is the vertex.

Class 9th Lines and Angles & Transversal Line

Lines and Angles

1. Acute Angle ( तीव्र कोण )

2. Right Angle ( समकोण )

3. Obtuse Angle ( अधिक कोण )

4. Straight Angle ( समरेखा कोण )

5. Reflexive Angle ( प्रत्यावर्ती कोण )

6. Complete Angle ( पूर्ण कोण )

Transversal Line

1. Corresponding Angles ( समान्तर कोण )

2. Alternate Interior Angles ( विपरीत आंतरिक कोण )

3. Alternate Exterior Angles ( विपरीत बाहरी कोण )

4. Vertically Opposite Angles ( लंबवत विपरीत कोण ) 

5. Co-Interior Angles ( सह-आंतर कोण )

6. Linear Pair Angles ( रेखिक युग्म कोण )