# Points, Lines and Planes

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1. Slide
60 seconds
2. Word cloud
180 seconds
What comes to mind when you think about geometry and its basic concepts?
3. Slide
60 seconds
Geometry was not invented by the Greeks - it was first developed in ancient Egypt and Babylon.
Did you know?
4. Slide
60 seconds
5. Slide
60 seconds
6. Slide
60 seconds
7. Drawings
450 seconds
Draw and label a point
8. Slide
60 seconds
9. Slide
60 seconds
10. Poll
60 seconds
What is a line in geometry?
• A closed shape with three or more sides
• A curved shape with no endpoints
• A straight path that extends infinitely in both directions
11. Drawings
450 seconds
Draw and label a line
12. Poll
60 seconds
How many points are needed to define a line?
• Three
• Two
• Four
13. Personalised Feedback
360 seconds
Can you define and name a line in geometry?
14. Drawings
450 seconds
Brain break: Draw a wobbly alien with wiggly arms and three eyes sticking out its head
15. Slide
60 seconds
16. Slide
60 seconds
17. Poll
60 seconds
What is a plane in geometry?
• A solid three-dimensional figure with flat surfaces and straight edges
• A two-dimensional flat surface that extends infinitely in all directions
• A curved line that does not intersect itself
18. Slide
60 seconds
19. Drawings
450 seconds
Draw and label plane DOGS
20. Open question
180 seconds
Work together in pairs: Q: What is a plane in geometry, and can you name an example?
21. Slide
60 seconds
22. Slide
60 seconds
23. Poll
60 seconds
Which of the following statements is true about collinear points?
• Collinear points are always equidistant from each other.
• Collinear points lie on the same line.
• Collinear points form a triangle.
24. Drawings
1260 seconds
Question: Given three points on a plane, how can you tell if they are collinear? Clues: • Remember that collinear points are all on the same line. • Look at the slope of the line connecting the points. • If the slope is the same, then the points are collinear. In pairs: Select and solve one of the tasks: A. Work in pairs to draw a set of three points that are collinear. B. Work in pairs to draw a set of three points that are noncollinear.
25. Slide
60 seconds
26. Poll
60 seconds
Which of the following statements is true about coplanar points?
• Coplanar points can be on different planes.
• Coplanar points lie on the same plane.
• Coplanar points are always collinear.
27. Slide
60 seconds
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60 seconds
29. Slide
60 seconds
30. Slide
60 seconds
31. Slide
60 seconds
32. Slide
60 seconds
33. Poll
60 seconds
What is the maximum number of lines that can be drawn through two coplanar points?
• One
• Infinite
• Two
34. Open question
180 seconds
What is the definition of collinear points?
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