# 1 cm ```Scale
Drawings
1
I CAN…
Find missing
measurements
using scale
drawings.
2
Vocabulary
 Scale drawing—A drawing that is
similar but either larger or smaller than
the actual object.
 Scale—On a map, intervals used
representing the ratio of distance on the
map to the actual distance.
3
Scale Drawing
Map
1 cm = 4.1 cm
Actual
4.5 km
d
Cross Multiply, then solve.
d = 18.5 km
 The distance on the
map between Coral
Springs and Fort
4.1 cm.
 We can use
proportions to
calculate the actual
distance between the
two locations.
4
 On the map, the
distance
between
Portland and
Olympia is
inches.
 What is the
actual distance?
 Remember:
map
actual
5
If the scale on a map of Kentucky reads 1
inch = 4.2 miles, and the distance between
Somerset and Middlesboro on the map
measures 13.5 inches, how many actual
miles apart are they?
6
Vocabulary
 Scale factor—A scale written as a ratio
in simplest form.
 Scale model—A model used to
represent something that is too large or
too small for an actual size model.
7
Find the Scale Factor
1. Find the scale factor of a blueprint if the
scale is 1 inch = 8 feet.
2. On a scale drawing of a new classroom,
the scale is 1 cm = 2.5 m. What is the
scale factor?
8
 Designers are creating a larger
model of the computer memory
board to use in design work. If
they use a scale of 20 inches = 1
inch, what is the length of the
model?
Scale:
Model
actual
Length of Model:
=
model
actual
9
Map Activity
 Using the map of North America, pick a
vacation destination that you would like
to visit.
 Next, using a ruler, measure the distance
in centimeters between Nashville (that is
the nearest airport) and your destination.
 Now you are going to calculate the actual
distance between the two locations.
10
Assignment
 Using grid paper, make a scale drawing
of your ideal bedroom (imagine that you
have won an extreme makeover contest).
 Be sure to use a ruler! You should also
draw furniture that is rectangular in shape
 Come up with a scale for your drawing.
 Using your scale, calculate the actual
dimensions of your room (length, width). 11
 Lastly, you are going to write 3-5 quiz
 Examples:
1. If the scale of my drawing is
1 cm = 4.5m, what is the scale factor?
 Tomorrow you will exchange scale
drawings and questions with a
12
Find the actual distance between each
pair of cities. Round to the nearest tenth
if necessary.
Cities
Map
Distance
Scale
Cities
Map
Distance
Scale
Kokomo,
Indiana and
Chicago,
Illinois
8 cm
1 cm = 25
km
Mobile and
Huntsville,
Alabama
14.5 in
1 in = 20 mi
Raleigh and
Charlotte,
North
Carolina
3.25 in
1 in = 40 mi
19.28 cm
2 cm = 125
km
Virginia
Beach,
Virginia and
Washington,
D.C.
8.5 cm
1 cm = 30
km
Knoxville,
Tennessee
and
Choctaw,
Oklahoma
Quebec,