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Isosceles triangles (1)
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Isosceles triangles (1)

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Transcript

  • 1. TrianglesTriangles
  • 2. Take arectangularpiece of paper.
  • 3. Take arectangularpiece of paper.Fold it in half
  • 4. Take arectangularpiece of paper.Fold it in halfUse a ruler todraw a linefrom the top ofthe fold to thebottom righthand corner.
  • 5. Take arectangularpiece of paper.Fold it in halfUse a ruler todraw a linefrom the top ofthe fold to thebottom righthand corner.Cut along theline.
  • 6. You should now have 3 triangles
  • 7. Can you prove that this is a lineof symmetry?
  • 8. Does this triangle have any otherline of symmetry?
  • 9. No it doesn’t. It only has the one.
  • 10. How can we prove that line ac is equal to line bc?a bcdBy folding along the line of symmetry. If you haven’t tried it, do it now.
  • 11. abcdbThis type of triangle,where two sides areequal, has a specialname.It is called anISOSCELES triangle
  • 12. abcdbStick this triangleinto your jotter andname it ISOSCELEStriangle.Now use the othertwo pieces of therectangle to makeanother isoscelestriangle.
  • 13. Your new triangle should look like this.How do we know it is isoscles?
  • 14. Which of these triangles do you think is isosceles?
  • 15. These are the isosceles triangles.Write in your jotter how we candescribe an isosceles triangleand how we can prove it isisosceles.