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Unformatted text preview: 74 Circles and Circumferences
Objective: Find the circumference of
a circle. 5Minute Check
Define a variable. Then write and solve an equation.
1. Shyam sold the family car for $200 more than half of
the original price. If he sold the car for $6540, what
was the original price?
2. Erik scored 13 points more than twice the lowest score
on a science test. If he scored 87 points, what was the
lowest score on the test? 74 Circles and Circumferences OA = OB = OC
All points on a circle
are equidistant from
its center. 74 Circles and Circumferences d = 2r
The diameter of a circle
contains the circle’s
center. 74 Circles and Circumferences
Circumference of a Circle
C = πd or C = 2πr 74 Circles and Circumferences
Example
Find the circumference of the circle if its
diameter measures 4.37 cm. Use 3.14 for π. 74 Circles and Circumferences
Example
Find the circumference of the circle if its
diameter measures 4.37 cm. Use 3.14 for π.
C = πd 74 Circles and Circumferences
Example
Find the circumference of the circle if its
diameter measures 4.37 cm. Use 3.14 for π.
C = πd
C = (π)(4.37) 74 Circles and Circumferences
Example
Find the circumference of the circle if its
diameter measures 4.37 cm. Use 3.14 for π.
C = πd
C = (π)(4.37)
C ≈ (3.14)(4.37) 74 Circles and Circumferences
Example
Find the circumference of the circle if its
diameter measures 4.37 cm. Use 3.14 for π.
C = πd
C = (π)(4.37)
C ≈ (3.14)(4.37)
C ≈ 13.7218 cm
The circumference is about 13.7 cm. 74 Circles and Circumferences
Activity:
1st. Measure the circumference of each
item. Place the amount in a table. Label the
amount as “circumference.”
2nd. Measure the diameter of each item.
Label the amount as “diameter.”
3rd. Calculate the relationship between the
diameter and circumference. Label this
amount as “Pi.” 74 Circles and Circumferences
Assignment: 12 – 28 even, 30 – 40 all. ...
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This note was uploaded on 12/01/2011 for the course MATH 110 taught by Professor Staff during the Fall '08 term at BYU.
 Fall '08
 Staff
 Algebra, PreAlgebra

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