4. Take a rectangular piece of paper. Fold it in half Use a ruler to draw a line from the top of the fold to the bottom right hand corner.
5. Take a rectangular piece of paper. Fold it in half Use a ruler to draw a line from the top of the fold to the bottom right hand corner. Cut along the line.
10. How can we prove that line ac is equal to line bc? a b c d By folding along the line of symmetry . If you haven’t tried it, do it now.
11. a b c d b This type of triangle, where two sides are equal, has a special name. It is called an ISOSCELES triangle
12. a b c d b Stick this triangle into your jotter and name it ISOSCELES triangle. Now use the other two pieces of the rectangle to make another isosceles triangle.
13. Your new triangle should look like this. How do we know it is isoscles?