1. Maps & Scale Drawings
Pg in the textbook

2. Warm up pg 21 IAN

3. Check homework 1-55 even page 269-272
2. Figures are not similar. The Ratio of the shorter side is 4:2, but the ratio of the longer side is 5:3. ft
53°
8. 111in
10. 81
12. 6
14.Height of a flag pole is hard to measure but you can use indirect measurement.
16. school bus tires are all circles, basketballs are all spheres; baseball diamonds are squares.
18. 3 ft
20. 10
90°
24. 36
26. 44
28. $588
30. B
32.B

4. Check homework 1-55 even page 269-272
44.
46.
48.
54. 3
34. X= cm 5g
8.7 oz
42.

5. POP Quiz

6. Maps & Scale Drawings pg 22
What is a scale drawing?
A scale drawing is an enlarged or reduced drawing of an object that is similar to the actual object.
Example-Maps and floor plans

7. Maps & Scale Drawings pg 22
What is a scale?
A scale is the ratio that compares a length in a drawing to the actual corresponding length in the actual object.
Example:
Is a 30 mile road is 1 in. long on a map, you can write the scale of the map
in these three ways.
1 in : 30 mi in=30 mi

8. Example pg 22 IAN Drawing (cm)→ ← Drawing (cm)
You have a scale drawing of a boat. The length of the boat on the drawing is 3 cm. What is the actual length of the boat?
The scale of the drawing is 1 cm= 1.5 meters
Write the scale in the form
Then write a proportion in which each ratio compares cm to meters.
Let n represent the length of the boat.
Drawing (cm)→ ← Drawing (cm)
Actual (m) → ← Actual (m)
Solve for n
n=4.5m

9. Check for understanding pg 22 IAN
If the mast of the boat is 10 cm tall on the drawing, and the scale is 1 cm =1.5 meters, about how tall is the mast of the actual boat?
Answer
15 meters

10. Real world problem solving pg 22
Turn in the text books to page 276
Geography Find the actual distance from charlotte to Winston-Salem.
Step 1 Use a cm ruler to find the map distance from Charlotte to Winston Salem. The amp distance is about 1.6 cm.
Step 2: Use a proportion to find the actual distance. Let n Represent the actual distance.
Map (cm) → ← Map (cm)
Actual length(km) → ← Actual length (km)
N=120

11. Check for understanding
Using the map on page 276 find the acutal distance between
Charlotte and Raleigh
Raleigh and Winston Salem

12. Finding the Scale pg 22 IAN
** you can use the GCF to find the scale of a drawing or a model** Refer to the model boxcar shown at the right. The actual length of a boxcar is 609 in. What is the scale of the model? Scale length→ Actual length→ We divided by the GCF of 7 So the scale of the drawing Is 1 in : 87 in.
|←←←←←← 7 in.→→→→|

13. Homework pg 23 IAN
Page odd Extra Credit Quiz grade Complete the investigation on page 280 Plan a trip.