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Hot Topics page 411

Hot Topics page 411. Numbers 1-10. Give the scale factor. 25 20. 20 16. 4 5 . 25/20 = 5/4 or 20/16 = 5/4. Give the scale factor. 14 14 14. 10 10 10. 7 5. 10/14 = 5/7.

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Hot Topics page 411

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  1. Hot Topics page 411 Numbers 1-10

  2. Give the scale factor. 25 20 20 16 4 5 25/20 = 5/4 or 20/16 = 5/4

  3. Give the scale factor. 14 14 14 10 10 10 7 5 10/14 = 5/7

  4. A document measuring 28 cm by 20 cm is enlarged by a scale factor of 3/2. What are the new dimensions? 28 cm x 20 cm y 2 3 3/2 = x/28 so x = 42 3/2 = y/20 so y = 30

  5. A photograph 8 in. by 6 in. is reduced to a length of 6 in. What is the width? 8 in 6 in 6 in x 8/6 = 6/x so x = 4.5 in.

  6. The scale factor is ½. What are the new dimensions? 26 m 10m 24m 2 1 5m, 13m, 12m

  7. The scale on a map is 1 in. = 10 mi. On the map, 2 towns are 3.5 in. apart. How far apart are they actually? 1 in/10 mi = 3.5 in/x so, x = 35 mi

  8. The scale on a map is 1 cm = 5 km. What length on the map would a road be that is 12.5 km long? 1 cm/5 km = x / 12.5 km so, x = 2.5 cm

  9. The scale factor of 2 similar figures is 4. If the smaller rectangle has an area of 2 sqft, what is the area of the larger figure? 1 4 Area = 2 sqft 4 x 4 = 16 x 2 = 32 sqft

  10. A square park has sides of 12 km. What is its area on a map that has a scale of 1 cm = 10 km? 1 cm/10 km = x / 12 km So, x = 1.2 cm 1.2 x 1.2 = 1.44 sq cm

  11. The scale factor of the 2 similar pentagons is 2/3. Find the new dimensions. • 15 15 • 12 12 • 21 10 8 14 3 2

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