1. Indirect Measurement

2. CFU: GLE SPI:

3. Indirect Measurement is a way
to find the measurement of
things around you. For instance,
have you ever wondered if the
Statue of Liberty has a nose
that is too big?

4. Typically, your nose is 1/8
the distance of your arm.
Try to use that ratio to find
the answer about Lady
Liberty’s nose.
You will need a ruler or tape
measure for this.

5. First measure your arm
and your nose….
Write your answers as a ratio:
Length of your nose
Length of your arm
Take a look at the next slide.

6. Come closer and look at the length of Lady Liberty’s arm.
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7. Now take the ratio from your measurements and write the proportion
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8. = Length of Lady Liberty’s nose Length of your nose x
Length of your arm

9. = Length of Lady Liberty’s nose Length of your nose x
Length of your arm
Try measuring your arm raised
as if you are holding a torch.

10. = Length of Lady Liberty’s nose 1 8 x
Now let’s use the ratio that your nose is usually 1/8 of your arm……

11. x
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Click once to
see the
actual size
revealed.

12. Now let’s try to find the
height of the Eiffel Tower.
What I know is that on
a sunny day, its shadow
is 328 feet long.

13. I know that it takes a fourteen
quarters stacked on top of
each other to make an inch.
What is your value in
quarters? Would you be worth
more if they were stacked or
laid end to end?

14. If you have ever seen Jurassic
Park, you saw how big the
dinosaurs were compared to the
people. Pretend that they made
a large Human to watch over the
animals. What would be the scale
factor if a 64 inch person was
made to be 160 feet?

15. The scale factor tells you how many times bigger than
“normal” that person really is.
You must make all units of
measure the same….
64 inches
64 inches
64 inches = =
160 feet
1920 inches
160 x 12

16. Now take the:
64 inches
And simplify
1920 inches
1/30 inches
This means that the person
was created 30 times his
normal size.

17. A real car is 6 inches long, while
the real car is 9 feet long. What
is the scale of the model?
Remember to put Model on top
of the actual measurement,
make them the same unit and
reduce ! 1 18
6 inches
9 feet
6 inches
108 inches

18. The diameter of a tire on the model of a car is 0.4 inches.
A model car has a scale factor of
1/64…
The diameter of a tire on the
model of a car is 0.4 inches.
What is the diameter of a tire
on the actual car?
The scale means that the car
is really 64 times larger.
So, .4 x 64 = 25.6
Hint