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Bellwork

Bellwork. What strategy should be used to find a fraction between 7/8 and 9/10? . Daily Activities. TIMED SKILL DRILLS. HOMEWORK REVIEW. Circumference. MS Framework Ob j: 4ac. 8 th Grade Pre-Algebra By: Mrs. Davis . Perimeter.

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Bellwork

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  1. Bellwork • What strategy should be used to find a fraction between 7/8 and 9/10?

  2. Daily Activities • TIMED SKILL DRILLS • HOMEWORK REVIEW

  3. Circumference MS Framework Ob j: 4ac 8th Grade Pre-Algebra By: Mrs. Davis

  4. Perimeter What is circumferenceand how is it used in the real world? • Definition: The distance AROUND the outside edge of the CIRCLE. • Relate:

  5. Confident Teen Volunteer Needed!

  6. Math in the Real WorldWalking Trail – Reading Problem Mrs. Davis is trying to tone up! Each morning she “speed walks” one time around circular walking trail. The trail has a diameter of 50 yards. What is the distance 1 time around the trail?

  7. Math in the Real WorldFerris Wheel – Reading Problem The DCMS math teachers took a ride on a Ferris Wheel. The radius of the Ferris Wheel is 38 m. What distance would they travel in one revolution? Who was the biggest CHICKEN??? #Coach Stiles

  8. Math in the Real WorldHorse Lunging Arena – Reading Problem • Lunging is a method used to exercise a horse or to teach him something new without a rider on his back. • A rope is attached to the horse’s harness. The rider then stands in the center of a ring and directs the horse to move in a circular rotation. A jumping horse lunging around an arena 60 feet in diameter travels what distance in 1 rotation?

  9. 3 in 14 m Words you need to know when dealing with circles. Circle Map Radius: Is the distance from the center of the circle to the outer edge. Pi ( ): The number used when working with circles. 3.14 Diameter: Is the distance from one side of the circle to the other. Circles

  10. Finding the Circumference of a Circle. • Circumference is the distance around the outer edge of a circle. • To find the circumference of a circle use the formula: C = ________ 14 m 3 in Radius (r) Diameter (d) radius = ______ C = ____ x ____ x ____ C = ______________ C = ____ x ____ x ____ C = ______________

  11. C = 2 r Guided Practice Mr. Jones is planning on building a circularshaped swimming pool in his backyard. If the radius of the pool is 15 ft, what is the distance around the outer edgeof the pool? Circumference Key Words • Outer Edge • Around • Rotation • Revolution C = ____ x ____ x ____ C = ______________

  12. You Try Mrs. Davis is trying to tone up! Each morning she “speed walks” one time around a circular walking trail. The trail has a diameter of 50 yards. What is the distance 1 time around the trail? C = 2 r C = ____ x ____ x ____ C = ______________ Circumference Key Words • Outer Edge • Around • Rotation • Revolution

  13. You Try Mark and Amanda took a ride on a Ferris Wheel. The radius of the Ferris Wheel is 38 m. What distance would you travel in one revolution? C = ____ x ____ x ____ C = ______________ C = 2 r

  14. C = 2 r You Try A jumping horse lunging around an arena 60 feet in diameter travels what distance in 1 rotation? C = ____ x ____ x ____ C = ______________ What key words tell you that we are dealing with circumference?

  15. Pertains to circles. Pertains to polygons. 9 cm Distance around the outer edge of a shape. Perimeter Circumference Calculate by adding the sides together. 9 m 6.5 m 9 m Double-Bubble Map Perimeter Vs. Circumference Calculate using formulas. C = _________ 6.5 m • What is the diameter of a circle? What is the radius? • What is the formula for finding circumference? • What number do we use for ? • How do you find the radius if only the diameter is given?

  16. Closure • What is the BIG CONNECTION between perimeter and circumference?

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