1. Dissector
10 cm
20 cm
One has a rectangle of dimensions 20 cm x 10 cm.
Make exactly two straight cuts and transform it into a
2
square of area 200 cm .
Explain!
2. Ratio
With four congruent
isosceles right triangles and
a square this pentagon was
composed. Determine the
ratio of the shaded area to
the area of the pentagon.
Justify your answer!
3. Cubic
This cube is made up of
black and white unit
cubes.
The black regions indicate
that the black cubes cross
the cube all the way
through the opposite face.
How many white cubes
make up the large
cube?
4. Good calculator
In the diagram the
product of the numbers
in each quarter of the
circle is the same.
Determine a x b x c.
10 30
16 6
4
b
24 a 15 12
10
c
