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.
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