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Circle Terms
Finding Radius
(find the radius for all)
Finding Diameter (Find Diameter for all)
Finding Circumference(Find Circumference for all)
Proportionality
100
The distance from the center of a circle to the outside, also half of the diameter
What is radius
100
The Diameter of this circle is 5
What is 2.5
100
The radius of this is 5
What is 10
100
The diameter for this circle is 10
What is 31.4
100

What is proportionality?

A relationship where two quantities maintain a constant ratio.

200
The longest chord in a circle
What is the Diameter
200
The diameter is 12
What is 6
200
The radius of this circle is 2.5
What is 5
200
The diameter for this circle is 13
What is 40.82
200

If 3 apples cost $6, what is the cost of 9 apples?

$18 (Since the cost per apple is $2, then 3×2=63×2=6 and for 9 apples, 9×2=189×2=18.)

300
A line through the circle.
What is a chord?
300
The diameter of this circle is 27
What is 13.5
300
The circumference of this circle is 15.7
What is 5
300
The diameter of this circle is 25
What is 78.5
300

A recipe calls for 2 cups of flour for every 3 cups of sugar. How much flour is needed for 9 cups of sugar?

6 cups of flour (Using the ratio 23=x932=9x, we find x=6x=6.)

400
The total amount of space inside of a circle
What is the area?
400
The diameter of this circle is 437
What is 218.5?
400
The circumference of this circle is 18.84
What is 6
400
The radius for this circle is 45
What is 282.6
400

If the ratio of boys to girls in a class is 4:5, how many girls are there if there are 32 boys?

40 girls (Since 4x=324x=32, x=8x=8, then 5x=405x=40.)

500
3.14 or 22/7
What is pi?
500
The diameter of this circle is 0.325
What is 0.1625
500
The diameter of this circle is 194.68
What is 62
500
The Diameter for this circle is 3285
What is 10314.9
500

A car travels 180 miles in 3 hours. At this rate, how far will it travel in 5 hours?

300 miles (Rate is 1803=603180=60 miles per hour. So, 60×5=30060×5=300.)