1 / 14

How could we find the amount of wood needed to frame a poster made from a photo?

How could we find the amount of wood needed to frame a poster made from a photo?. In this lesson you will learn how to compute an actual perimeter from a scale drawing by using ratios and proportions. A proportion is an equation that relates two equal ratios. For example:. =.

raymond-abbott
Télécharger la présentation

How could we find the amount of wood needed to frame a poster made from a photo?

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. How could we find the amount of wood needed to frame a poster made from a photo?

  2. In this lesson you will learn how to compute an actual perimeter from a scale drawing by using ratios and proportions.

  3. A proportion is an equation that relates two equal ratios. For example: =

  4. Find the length of TQ by cross multiplying 10 W X Q 6 R 15 ? (6)(15) = (10)(TQ) 90 = (10)(TQ) T S Z Y TQ = 9

  5. Mixing up the order of one ratio in a proportion 8 11 = 16 B 22 M - 12 L 24 N A C

  6. Ratio of perimeters 4 A B 8 Q R P = 8 + 6 + 8 + 6 3 P = (2 x 8) + (2 x 6) C D 6 P = 4 + 3 + 4 + 3 Perimeter = 28 P = (2 x 4) + (2 x 3) T S Perimeter = 14

  7. Perimeter of LMN = ? MN :BC = 18 : 24= 3 : 4 = 3 : 4 M perimeter :PERIMETER 18 L = 16 + 24 + 30 = 70 PERIMETER N B = 16 210 = 4(perimeter) 24 A perimeter = 52.5 30 C

  8. How large is the frame? = 2 : 15 = 4 : 30 small : LARGE 4 in = 2(6) + 2(4) = 20 in perimeter 6 in = = 300 2P 30 in P = 150 in

  9. In this lesson you have learnedhow to compute an actual perimeter from a scale drawing by using ratios and proportions.

  10. Find the base of the large triangle if the scale factor of the small perimeter to the large perimeter is 3 : 5 for these similar triangles. 6 6 15

  11. If the scale factor of a small figure to a large figure is 3 to 7, what will be the scale factor of the large figure’s perimeter to the small figure’s perimeter? Explain.

  12. Find the length of side DF. 7 cm 15 cm E Q ? cm P Perimeter of PQR = 40 cm R D Perimeter of DEF = 90 cm F

  13. 1. Find the perimeter of the large rectangle. 84 16 28

  14. 2. If the scale factor of the large perimeter to the small perimeter is 9:5, find the length of AD. B 17 C M L 16 12 K N 30 A D

More Related