bellwork what strategy should be used to find a fraction between 7/8 and 9/10?
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MS Framework Ob j: 4ac 8 th Grade Pre-Algebra By: Mrs. DavisTRANSCRIPT
Bellwork What strategy should be used to find a
fraction between 7/8 and 9/10?
Daily Activities
TIMED SKILL DRILLS HOMEWORK REVIEW
CircumferenceMS Framework Ob j: 4ac
8th Grade Pre-Algebra
By: Mrs. Davis
What is circumference and how is it used in the real world?
Definition: The distance AROUND the outside edge of the CIRCLE.
Relate:Perimeter
Confident Teen Volunteer Needed!
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?
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 biggestCHICKEN???#Coach Stiles
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?
Radius:Is the distance from the center of the circle to the outer edge.
3 in
Words you need to know when dealing with circles.
Diameter:Is the distance from one side of the circle to the other.
Circles
14 m
Pi ( ):The number used when working with circles.
3.14
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 m3 inDiameter (d)
Radius (r)
C = ____ x ____ x ____
C = ______________
radius = ______
C = ____ x ____ x ____
C = ______________
Guided Practice
Mr. Jones is planning on building a circular shaped swimming pool in his backyard. If the radius of the pool is 15 ft, what is the distance around the outer edge of the pool?
C = 2 r
C = ____ x ____ x ____
C = ______________
Circumference Key Words
· Outer Edge· Around· Rotation· Revolution
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
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 = 2 r
C = ____ x ____ x ____
C = ______________
You Try
A jumping horse lunging around an arena 60 feet in diameter travels what distance in 1 rotation?
What key words tell you that we are dealing with circumference?
C = ____ x ____ x ____
C = ______________
C = 2 r
Double-Bubble Map
Distance around the outer edge of a shape.
Perimeter
Circumference
Pertains to polygons.
Pertains to circles.
Calculate by adding the sides together.
9 m
9 m
6.5 m
Perimeter Vs. Circumference
6.5 m
Calculate using formulas.
C = _________
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?9 cm
ClosureWhat is the BIG CONNECTION between
perimeter and circumference?