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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:. =.

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

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  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

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