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

1. Thinking about the
dimensions of spheres
and about scale factors
Sphere by flickr user Kirstenv

3. 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

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. 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?

6. 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?

7. 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?

8. 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?

9. 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?