Cartoon
Similarity
Using cartoons to draw similar
figures
The Cartoon
What to do with your
cartoon:
cut around the edges of
your cartoon so that
they are straight
(use a ruler to create a
border if it doesn’t have
one)
The Cartoon
After you cut out the cartoon:
Glue your cartoon to a white sheet of paper – in one of the
corners, but not right against edge
like this…
The Grid
Use a ruler to measure the length and width of your
cartoon in centimeters and write it on your paper –
near your cartoon
5cm
Yours may not be
5cm – this is
just an example
5cm
The Grid
Now…Time to draw the grid!
On the paper (not on the cartoon), Make one
centimeter marks on opposite sides
1cm 1cm 1cm 1cm 1cm
1cm
1cm
1cm
1cm
1cm
Start on the left and go
towards the right across
the top and bottom
Be careful measuring –
your grid will turn out
better
the last block may be
smaller than one
centimeter
The Grid
Now…Time to draw the grid!
Connect the marks…
BE careful you have one shot at this!
1cm 1cm 1cm 1cm 1cm
1cm
1cm
1cm
1cm
1cm
It is okay if all your
squares aren’t
exactly the same
size – but try to get
them as close as
possible
The Scale Drawing
Time to blow up your cartoon. The scale factor
is 4. You are making your cartoon 4 times as
large. What do you do?
1cm 1cm 1cm 1cm 1cm
1cm
1cm
1cm
1cm
1cm
multiply
everything by
four!
The Scale Drawing
You need to create a grid that is four times as
large as your original. My original is 5cm by
5cm. You have a choice here: You can choose
a scale of 1cm to 4cm, or you can make it
huge and go from 1cm to 4in
The Cartoon
Depending on how big your cartoon is,
you may need to add paper to your
original sheet
The Drawing
To draw the large grid you need to multiply
the length and width of the small cartoon
by four and then draw a new large square
or rectangle
The Scale Drawing
You need to create a grid that is four
times as large as your original. My
original is 5cm by 5cm. I’m choosing
1cm to 4cm, so my new grid is 20cm to
20cm
Now mark off
4cm marks!
– Left to right
and top to
bottom
The Drawing
Now you can draw! You do not have to
know how to draw to do this. The grid
helps you with spatial relationships…
The Drawing
Now you can draw! You do not have to know how to
draw to do this. The grid helps you with spatial
relationships…
Notice spatial
relationships here
and it will look
Exactly like
original
Draw the
new
picture
one
square
at a time
Cartoon Similarity
Finished Product
Questions
Write the questions and then answer them on
your scale drawings – use your text to help.
1. How does the scale factor affect the size of
a shape or figure?
2. What is a dilation? How does it relate to
scale drawings?
3. Is a dilation an Isometry? Why or Why Not?