1. Day 6 Circumference.notebook April 15, 2013
AIM: Circumference of a Circle
Do Now
A computer technician from Tech Aids is helping you setup your new
home computer. The technician needs to download and setup three
pieces of software. The size of the software files are 90.5 MB
(megabytes), 271.5 MB, and 447 MB.
The download time of the first piece of software is shown below:
If the rate of download is the same for the other two pieces of
software, approximately how much time will it take the technician
to download all three pieces of software?
A 7 minutes
B 9 minutes
C 11 minutes
D 24 miuntes
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2. Day 6 Circumference.notebook April 15, 2013
Bring 2 Sharpened
Pencils Friday
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3. Day 6 Circumference.notebook April 15, 2013
Anticipatory Set:
Fill the What I Know and What I Want to Learn
sections of the following KWL Chart based on your
knowledge of finding the circumference of a circle.
What I Know What I Want to Learn What I Learned
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4. Day 6 Circumference.notebook April 15, 2013
QUESTION: What is the relationship between the
radius and diameter of a circle?
Circumference of a Circle Formulas
1.) C = πd
2.) C = 2πr
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5. Day 6 Circumference.notebook April 15, 2013
1
Find the circumference of the following circle. Use the Pi
Button and round your final answers to the nearest
hundredth.
7y
d
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6. Day 6 Circumference.notebook April 15, 2013
2
Find the circumference of the following circle. Use the Pi
Button and round your final answers to the nearest
hundredth.
cm
13
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7. Day 6 Circumference.notebook April 15, 2013
3
A 153 m
B 306 m
C 76.5 m
D 151 m
Find the circumference and leave the answer in Pi notation.
Radius = 153 m
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8. Day 6 Circumference.notebook April 15, 2013
4
A 2053 m
B 1026.5 m
C 4106 m
D 513.25 m
Find the circumference and leave the answer in Pi notation.
Diameter = 2053 m
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9. Day 6 Circumference.notebook April 15, 2013
QUESTION: Determine a method to find the radius or
diameter if you are given the circumference. Explain
your method.
Example: The circumference is 56 inches, what is the radius?
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10. Day 6 Circumference.notebook April 15, 2013
5
If the circumference of a circle is 56 inches, find the
length of the radius and the diameter. Use the Pi Button
and round your final answers to the nearest tenth.
Radius = _____
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11. Day 6 Circumference.notebook April 15, 2013
6
The circumference of the Superdome in New Orleans
is 2135.2 feet. Find the length of the radius and the
diameter of the Superdome. Use the Pi Button and
round your final answers to the nearest tenth.
Diameter = ______
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12. Day 6 Circumference.notebook April 15, 2013
7
The circumference of a circle is 30π inches.
Find the radius and diameter.
Radius = _____
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13. Day 6 Circumference.notebook April 15, 2013
BEFORE YOU LEAVE
Go back to the KWL Chart in the
Anticipatory Set and fill in the What
I Learned section.
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14. Day 6 Circumference.notebook April 15, 2013
Mr. Tjersland's Math 7
Homework: On Core Page 114 #1-3, 5-9 (Use Pi Button)
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15. Day 6 Circumference.notebook April 15, 2013
AIM: Circumference of a Circle
Circumference of a Circle Formulas
1.) C = πd
2.) C = 2πr
Find the circumference of the following circle. Use the Pi
Button and round your final answers to the nearest
hundredth.
cm
13
15

16. Day 6 Circumference.notebook April 15, 2013
AIM: Circumference of a Circle
Circumference of a Circle Formulas
1.) C = πd
2.) C = 2πr
If the circumference of a circle is 56 inches, find the
length of the radius and the diameter. Use the Pi Button
and round your final answers to the nearest tenth.
Radius = _____
16