Chapter Overview
The chapter Lines and Angles introduces students to the basics of geometry, focusing on types of lines, line segments, rays, and different kinds of angles. It also helps students understand how angles are formed and measured, and their presence in daily life and mathematical shapes.
Important Keywords
- Point: A precise location or position in space.
- Line: A straight one-dimensional figure having no thickness and extending infinitely in both directions.
- Line Segment: A part of a line that has two endpoints.
- Ray: A part of a line that starts at a point and extends infinitely in one direction.
- Angle: Formed when two rays meet at a common endpoint called the vertex.
- Acute Angle: An angle less than 90°.
- Right Angle: An angle exactly equal to 90°.
- Obtuse Angle: An angle more than 90° but less than 180°.
- Straight Angle: An angle exactly equal to 180°.
- Adjacent Angles: Two angles that share a common side and vertex.
Detailed Notes
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