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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)
Circles in Nature Trivia
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

You can see this circular shape in the sky during the day.

What is the Sun?


200

The line that goes through the center of the circle and end on the 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

These naturally half-circular shapes form when water droplets reflect sunlight after a storm.

What is a rainbow?


300

The middle of the circle.

What is the center?

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

The circular growth rings of this natural object tell its age.

What is a tree?


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

Circular depressions formed by meteor impacts are known as this.

What are craters?

500
3.14 or 22/7
What is pi?
500
The diameter of this circle is 0.325
What is 0.1625
500

The circumference of this circle is 194.68

What is 62

500
The Diameter for this circle is 3285
What is 10314.9
500

Many flowers, like daisies and sunflowers, grow seeds and petals in circular arrangements based on this mathematical pattern.

What is the Fibonacci sequence (or golden spiral)?