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# Applied 20S January 21, 2009

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Working with proportions, scale factors, and finding the radius of a sphere given it's surface area or volume.

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### Applied 20S January 21, 2009

1. 1. Thinking about the dimensions of spheres and about scale factors Sphere by ﬂickr user Kirstenv
2. 2. We lost some of our slides today due to human error (I goofed). TO make up for it I've embedded the video on the next slide that talks about some of the things we've been working on. http://ca.youtube.com/watch?v=Q8inC8ngOBQ
3. 3. The diagram below represents an area to have lawn sod laid down. The scale is 1:20. a. What is the area of the yard? b. If sod costs 5.00 for 10 square feet, how much will it cost to sod the whole yard?
4. 4. The diagram below represents an area to have lawn sod laid down. The scale is 1:20. a. What is the area of the yard? b. If sod costs \$5.00 for 10 square feet, how much will it cost to sod the whole yard?
5. 5. 2 The area of ﬁgure F is 30 cm . If the dimensions of ﬁgure F are multiplied by a scale factor of 4, what is the area of the new ﬁgure?
6. 6. The volume of solid S is 24 m 3 . If the dimensions of S are tripled, what is the volume of the newly formed solid?
7. 7. The Surface Area of a sphere is 1256 sq. cm. What is it's radius? The Surface Area of a sphere is 1256 sq. cm. What is it's circumference? HOMEWORK The Surface Area of a sphere is 1256 sq. cm. What is it's volume?
8. 8. The volume of a sphere is 7234.56 cu. cm. What is it's radius? HOMEWORK The volume of a sphere is 7234.56 cu. cm. What is it's circumference? The volume of a sphere is 7234.56 cu. cm. What is it's Surface Area?