Pre-Algebra Lesson 7-4

Pre-Algebra Lesson 7-4 - 7-4 Circles and Circumferences...

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Unformatted text preview: 7-4 Circles and Circumferences Objective: Find the circumference of a circle. 5-Minute 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? 7-4 Circles and Circumferences OA = OB = OC All points on a circle are equidistant from its center. 7-4 Circles and Circumferences d = 2r The diameter of a circle contains the circle’s center. 7-4 Circles and Circumferences Circumference of a Circle C = πd or C = 2πr 7-4 Circles and Circumferences Example Find the circumference of the circle if its diameter measures 4.37 cm. Use 3.14 for π. 7-4 Circles and Circumferences Example Find the circumference of the circle if its diameter measures 4.37 cm. Use 3.14 for π. C = πd 7-4 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) 7-4 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) 7-4 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. 7-4 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.” 7-4 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.

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Pre-Algebra Lesson 7-4 - 7-4 Circles and Circumferences...

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