1 / 10

Proportions and Scale Drawings

Proportions and Scale Drawings. Textbook Pages 417-422. Objective. I can solve scale drawing problems using proportions. Vocabulary. Scale Drawing: is the same shape but not the same size. A map is a scale drawing. The units are very important.

king
Download Presentation

Proportions and Scale Drawings

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Proportions and Scale Drawings Textbook Pages 417-422

  2. Objective • I can solve scale drawing problems using proportions.

  3. Vocabulary • Scale Drawing: is the same shape but not the same size. A map is a scale drawing. The units are very important. • Scale: tells us how the drawings dimensions and the actual dimensions are related. (Ratio) • The standard way to write the scale is scale model to actual object or scale:actual

  4. Interpreting Scale Drawing • 3 inches • The scale is 1 in. : 5ft • Find the actual length of the canoe. • 1in3 in. 5ft ?ft What did you do to 1 to get to 3. Multiplied by 3. So multiply 5 by 3 to get 15 ft.

  5. Scale 1 in : 8ft • If the scale model is 4 inches; What is the actual? • 32 feet • If the actual is size is 40 feet, what is the scale model? • 5 inches

  6. Try some! • The scale of a drawing 2 in.: 6m • Length of the drawing = 8in. • Length of object = __________ • Length of object = 36 m • Length of drawing = __________

  7. Word Problems You are building a model boat with a scale of 1 in.:2ft. The actual boat is 18 feet long. How long should you make your model? 9 inches

  8. Using it to find area and perimeter. • A scale drawing of this classroom is 2cm by 3 cm. The scale is 1cm:2m. What is the area of the classroom? • Covert both measurements to make the actual length and width. • 1cm2cm1cm3cm 2 m w 2m L Width is 4 m Length is 6 m Area is 4 x 6 = 24m squared

  9. Draw a diagram • Using the scale 1in.:10ft, make a scale drawing of a 30ft by 40 foot dance floor. • You should have a 3in by 4in drawing • Use your drawing to find the actual distance from opposite corners. • If you measured on your scale drawing you would find it to be 5 inches. • Using the scale it would convert to 50 ft.

  10. Practice • Workbook Pages 107-108 1-12

More Related