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Geometry

Geometry. By Miss O. Geometry ( jee - om - i -tree) – n. The branch of mathematics concerned with the properties of and relationships between points, lines, planes, and figures. Geometry is ancient.

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Geometry

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  1. Geometry By Miss O.

  2. Geometry (jee-om-i-tree) – n. • The branch of mathematics concerned with the properties of and relationships between points, lines, planes, and figures.

  3. Geometry is ancient. • The earliest records of geometry can be traced to ancient Egypt and the Indus Valley from around 3000 BC.

  4. Euclid • Euclid, a Greek mathematician, wrote The Elements of Geometry. • He presented geometry in a practical form known as Euclidean geometry Euclid’s was not the first important early texts on geometry.

  5. Point • An exact location in space; named by a capital letter

  6. Line • A straight path that extends forever in opposite directions; named by two points on the line • RS S R

  7. Line segment • A part of a line with two endpoints; named by the two endpoints • PZ P Q Z

  8. Plane • A flat surface that extends without end in all directions

  9. Ray • A part of a line with one endpoint that extends forever in one direction; named by the endpoint first followed by another point on the ray

  10. Angle • Two rays joined at a common endpoint called the vertex; named by the vertex or the vertex and a point on each ray

  11. Vertex • The point on an angle or polygon where two lines or rays meet; named with a capital letter Vertex

  12. Right angle • 90 degrees • Square corner • Little box

  13. Acute Angle • Less than 90 degrees

  14. Obtuse Angle • More than 90 degrees

  15. Straight Angle • 180 degrees • Straight line http://www.youtube.com/watch?v=yptZt9hwrzU&safety_mode=true&persist_safety_mode=1&safe=active

  16. Activity 1 • Build all 4 angles with your bodies on the carpet. Each group will have 4 students in it. • Miss O. will come around to take a photo of each angle for the website!

  17. Activity 2 • Play “Simon Says” with each hand motion that represents a geometric term we learned today!

  18. Intersecting Lines • Lines that pass through the same point

  19. Parallel Lines • Lines that never intersect

  20. Perpendicular Lines • Lines that form right angles (90 degree angles) • All perpendicular lines are also intersecting lines!

  21. What geometric term is represented?

  22. What geometric term is represented?

  23. What geometric term is represented?

  24. What geometric term is represented?

  25. What geometric term is represented?

  26. What geometric term is represented?

  27. What geometric term is represented?

  28. What geometric term is represented?

  29. What geometric term is represented?

  30. What geometric term is represented?

  31. What geometric term is represented?

  32. Talk and Turn: • In the world around you, where do you see geometric figures in real life every day? • Make a list with your partner of at least 3 ways!

  33. Find all the angles

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