- Slides: 15
Lines, Line Segments, Rays and Angles Press the small microphone on each slide to hear the explanation of the lesson. Make sure the volume is increased on your laptop to hear me clearly.
What is a Line? • A line is a straight path that goes on forever in both directions.
What is a line segment? . . • A line segment is part of a line that has two endpoints.
What is a ray? • A ray is a part of a line that has one endpoint and goes on forever in one direction.
What are intersecting lines? • Lines that cross at any point are intersecting lines.
What are perpendicular lines? • Two lines that cross to form a right angle are perpendicular lines.
What are parallel lines? • Parallel lines are lines that never intersect.
What is a vertex? • A vertex is the point at which two lines, line segments or rays meet to form an angle. • More than one vertex are called vertices.
What is a right angle? • A right angle makes a square corner.
What is an acute angle? • An acute angle is an angle that is open less than a right angle. • “A cute little angle”
What is an obtuse angle? • An obtuse angle is an angle that is open more than a right angle.
Practice Name each figure. 1. 3. 2. 4. 5.
Intersecting or Perpendicular? 1. 1. 2. 2. 3.
Obtuse or Acute? 1. 3 2. 4.
For more practice • https: //www. k 5 learning. com/worksheets/m ath/grade-3 -geometry-lines-segments-rays -b. pdf • https: //www. k 5 learning. com/worksheets/m ath/grade-3 -geometry-parallelperpendicular-lines-b. pdf