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Lines and Angles

Lines and Angles. 5Cathie 2010. A line has no beginning point or end point. Imagine it continuing indefinitely to both directions. We can illustrate that by little arrows on both ends. Draw some lines …. Draw some lines ….

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Lines and Angles

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  1. Lines and Angles 5Cathie 2010

  2. A line has no beginning point or end point. Imagine it continuing indefinitely to both directions. We can illustrate that by little arrows on both ends.

  3. Draw some lines …

  4. Draw some lines …

  5. A line has no beginning point or end. A line segment has a beginning point and an end point. . All the sides of this triangle are line segments.

  6. Draw some line segments …

  7. A line has no beginning point or end A line segment has a beginning point and an end point. . All the sides of this triangle are line segments.

  8. A ray has a beginning point but no end point. Think of sun's rays: they start at the sun and go on forever...

  9. Draw some rays…

  10. A ray has a beginning point but no end point. Think of sun's rays: they start at the sun and go on forever...

  11. What is an angle?

  12. Draw some angles…

  13. Show a zero angle?

  14. Show a zero angle?

  15. Show an acute angle?

  16. Show an acute angle? In each picture the angle keeps getting bigger. The arc of the circle is larger. The angle is opened more and more. These angles are acute angles, which means they are less than a right angle. Think of the acute angles as sharp angles. If someone stabbed you with the vertex of the angle, it would be sharp.

  17. What about a right angle?

  18. What about a right angle?

  19. What is the name of the other type of angle?

  20. What is the name of the other type of angle? obtuse

  21. Draw an obtuse angle and write a description of one 

  22. Draw an obtuse angle and write a description of one  The angle is opened even more and is bigger than the right angle. It is an obtuse angle. Obtuse angles are dull angles.

  23. What is this angle called?

  24. What is this angle called? The Straight Angle.

  25. Which angle is bigger?

  26. Which angle is bigger?

  27. New terms to remember Right angle Line Ray Line segment Angle Obtuse angle Zero angle Straight angle Acute angle

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