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Do Now #41 11/13/14

Do Now #41 11/13/14. Jim wants to tile his shower wall. The wall is 7.5 feet tall and 4.5 feet wide. 1) What is the area of the wall? 2) If the tiles cost $1.50 per square foot, how much will it cost to tile the whole wall?. Homework Review/Dipstick Quiz. Chapter 3B Extension.

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Do Now #41 11/13/14

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  1. Do Now #41 11/13/14 • Jim wants to tile his shower wall. The wall is 7.5 feet tall and 4.5 feet wide. • 1) What is the area of the wall? • 2) If the tiles cost $1.50 per square foot, how much will it cost to tile the whole wall?

  2. Homework Review/Dipstick Quiz

  3. Chapter 3B Extension Parts of a Circle

  4. Parts of a Circle Diameter Radius . Center Circumference (outside)

  5. DIAMETER - Definition The distance across a circle passing through the center A diameter cuts the circle exactly in half

  6. RADIUS - Definition The distance from the center of a circle to any point in the circumference Plural Form: Radii 2 Radii = 1 diameter

  7. CENTER - Definition The center point of a circle .

  8. CIRCUMFERENCE - Definition The distance around the circle There are 2 formulas used to find the circumference of a circle C = ∏d OR C =2∏r

  9. ∏ Facts ∏ ≈ 3.14 • Pi (∏) is pronounced like the word pie • ∏ is the 16th letter of the alphabet • ∏ is an irrational number (never ending and no digits repeat) • ∏ can be expressed as a fraction • Math Holiday - PI DAY Anyone Guess the Date???

  10. Here are the 1st 100 digits of PI 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067…

  11. Finding Circumference You could find the circumference of a circle given EITHER the diameter OR the radius

  12. Circumference Formulas GIVEN THE DIAMETER C = ∏d C = 3.14 x diameter GIVEN THE RADIUS C = 2∏r C = 2 x 3.14 x radius OR C = 6.28 x radius

  13. Given Diamter Example 1

  14. Given Diameter Example 2

  15. Remember… When given the RADIUS of the circle you must use C = 2∏r to find the circumference of the circle because doubling the radius gives you the diameter.

  16. Given Radius Example 1

  17. Given Radius Example 2

  18. You Try In Your Notebook… #1 Find the Circumference

  19. You Try In Your Notebook… #2 Find the Circumference 6.2 in

  20. Word Problem #1 – Critical Thinking • Master Pizza in Union offers large pizzas that have a diameter of 12 inches and medium pizzas that have a diameter of 8.5 inches. What is the difference in circumference between the two pizza sizes?

  21. Word Problem #2 – Critical Thinking • The circular runners path in New York’s Central Park has a radius of 1.25 miles. What is the distance around the entire runners path? • If Lauren can jog one mile in 9 minutes, how long will it take her to jog the entire path?

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