February 24, 2012
7.5 Using Proportional Relationships
Indirect measurement: any method that uses formulas, similar
figures, and/or proportions to measure an object.
1. Tyler wants to find the height of a telephone pole. He
measured the pole's shadow and his own shadow and then
made a diagram. What is the height of the pole?
h
5ft 9in
38ft 4in
7ft 8in
February 24, 2012
3. Lady Liberty holds a tablet in her left hand. The
tablet is 7.19m long and 4.4m wide. If you made a
scale drawing using the scale 1cm:0.75m, what would
be the dimenstions to the nearest tenth?
February 24, 2012
4. Given that LMN
area A of QRS.
QRS, find the perimeter P and
M
R
13cm
9.1cm
L
P=36cm
A=60cm2
N
Q
S