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?