Sec. 9.4

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Sec. 9.4

  1. 1. Learning Target:Students will learn how to classify triangles using their angles measures and by using their side lengths. <br />
  2. 2. Remind me what the degrees are of an acute, obtuse, right and straight angle.<br />
  3. 3. There are two main ways to classify triangles… Either by it’s angles or it’s sides.<br />
  4. 4. Classifying Triangles by Angleshttp://kensmathworld.com/videos/classifying.png<br />
  5. 5. Equilateral Triangle:All three sides of the triangle are the same length.http://www.mathwarehouse.com/geometry/triangles/images/equilateral-tiangle.jpg<br />
  6. 6. Isosceles Triangles:Two sides of the triangle have the same lengths.http://image.wistatutor.com/content/feed/u984/isosceles.jpg<br />
  7. 7. Scalene Triangle:All three sides of the triangle have different lengths.http://www.printable-math-worksheets.com/images/Scalene_Triangle.gif<br />
  8. 8. http://www.glogster.com/media/4/28/54/52/28545238.gif<br />
  9. 9. Classify the triangle by its angles.Classify the triangle by its sides.Examples on pg. 472<br />
  10. 10. How many degrees are in a triangle?<br />
  11. 11. How many degrees are in a triangle?A: Every triangle, no matter the size or configuration, is made up of 180 degrees.<br />
  12. 12. Tell whether the three angle measures could be the measures of a triangle. Justify your answer.1.) 10, 70, 802.) 18, 23, 139<br />
  13. 13. Tell whether the three angle measures could be the measures of a triangle.1.) 10, 70, 80 – No because the sum of the angles are 160 degrees.2.) 18, 23, 139 – Yes because the sum of the angles are 180 degrees. <br />
  14. 14. Can you classify triangles using their angles measures and by using their side lengths?<br />

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