Vocab
It is the point in the center or middle of a circle
What two formulas do we use for circumference?
C = 3.14 * d
C = 3.14 * 2 * r
If the radius is 10.5 cm, what is the diameter
d= 21 cm
Does the order in which you write a ratio matter?
YES!
What is the address of South Middle School?
105 Keith ave, Brockton Ma.
Define radius
The radius of a circle is a line segment formed by connecting a point on the circle and the center of the circle
Driver’s Delight has 3 circular go-cart tracks.
Track 1 has a radius of 60 feet.
Compute the circumference of Track 1.
The circumference of Track 1 is approximately 376.8 ft.
The radius is 15 inches
There are 50 students in the class. 10 of them are wearing glasses. 12 are wearing masks. 30 have long hair.
What is the ratio of students that are wearing glasses to students who have long hair?
10:30
What two specialists have the same last name as previous presidents?
Miss Jackson
Miss Jefferson
Define diameter
The distance across a circle through the center is the diameter of the circle. The diameter of a circle is a line segment formed by connecting two points on the circle such that the line segment passes through the center point.
Driver’s Delight has 3 circular go-cart tracks.
Track 2 has a radius of 85 feet.
Compute the circumference of Track 2.
The circumference of Track 2 is approximately 533.8 ft.
What is the relationship between the length of a radius and the length of a diameter?
The length of a radius is half the length of a diameter because two radii form each diameter.
There are 50 students in the class. 10 of them are wearing glasses. 12 are wearing masks. 30 have long hair.
What is the ratio of students that are wearing glasses to students who are not?
10:40
What does the class earn for displaying ROAR?
A DRAGON !
Define circumference
You call the distance around a circle the circumference of the circle.
Driver’s Delight is considering building a new track.
They have a circular space with a diameter of 150 feet.
Compute the circumference of the circular space.
The circumference of the space is approximately 471 ft.
Circle A has a diameter of 15cm. Circle B has a radius of 10. Which circle has a larger circumference?
Circle B
There are 50 students in the class. 10 of them are wearing glasses. 12 are wearing masks. 30 have long hair.
What is the ratio of students that have long hair to students wearing a mask?
30:12
What is the Assistant Principals name here at South Middle School?
Mr. Garcea
Define Ratio & the three ways to write it
A ratio is a comparison between two quantities. You can write it as a fraction, with a colon :, or with the word "to"/"per"
The owner of Driver’s Delight is considering building new go-cart tracks.
If she wants the track to have a circumference of 200 feet, what is the length of the radius?
The radius of the track should be approximately 31.85 ft.
Compute the length of the diameter of the circle with a circumference of 65.94 feet.
Hint:
Step 1 - write the equation
Step 2 - substitute
Step 3 - inverse operations
d ≈ 21 ft
What makes a Rate similar and differenced from Ratio?
A rate is similar to a ratio because the are both comparing two numbers.
A rate is different because it specifically is a comparison between a quantity and TIME.
What movie can be confused for a Christmas Movie?
The Nightmare before Christmas