Download presentation

Presentation is loading. Please wait.

1
5.4: Scale Drawings

2
Scale Factor The relationship between measurements on the drawings can be described by using a scale factor. When you make a drawing twice as wide and twice as tall, your scale drawing has a scale factor of 2:1. 1/2 inch on the original = 1 inch on the scale drawing.

3
**measurement on model : measurement on actual or original**

Scale Factor So, the scale factor is always written as measurement on model : measurement on actual or original Or Original: Each square = ½ inch Drawing: Each square = 1 inch Scale Factor: 2:1 or 2/1

4
**Simplifying the Scale Factor**

Original: Drawing: Each square= 1/2 inch Each square = 1/4 inch What is the scale factor on the smaller scale drawing of Calvin?

5
**Scale Factor Scale factors are usually expressed using 1 unit.**

Real Eiffel Tower: 324 meters tall LEGO Eiffel Tower: meters tall. Instead of writing 1.08 : 324, we write 1 : 300 or 1/300

6
Common Scale Factors House Plans/Floor Plans: ¼” scale, which means 1/4 inch stands for 1 foot: 1:48. N scale model trains: 1:148. Hot Wheels: 1:64 Radio-controlled car: 1:10 Traditional Dollhouses: 1:12, 1:18, or 1:24 Barbie Dollhouse: 1:6

7
**Using scale factors: Practice**

8
**Scale Models and Drawings are Proportional**

The reason a scale model or scale drawing looks similar to the actual or original thing is that all measurements on the model/drawing are proportional to measurements on the actual/original. This means that every part of the drawing is the same number of times bigger or smaller than the original or real thing. Stewie’s foot on the original drawing is ½ inch long. How long is Stewie’s foot on a 2:1 drawing? On a 0.5:1 drawing? If you made a 10:1 scale drawing of the original Stewie, how long would his foot be?

9
Scale Another way to relate models to actual things is to use a scale, which includes units in different measurements.

10
**Use a Proportion to Solve Scale Drawing/Model problems.**

11
Practice

Similar presentations

Presentation is loading. Please wait....

OK

Scale Drawings and Models

Scale Drawings and Models

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on omission of articles in english Ppt on deforestation in india Ppt on object recognition in dip Ppt on micro operations of an airport Ppt on obesity management systems Ppt on asia continent map Ppt on forward rate agreement currency Ppt on nitrogen cycle and nitrogen fixation lightning Ppt on journal ledger and trial balance Ppt on critical care nursing