Definitions
The line segment that goes through the center of the circle, touching both sides
What is the diameter?
With a radius of 4cm, this circles diameter would be...
8 cm
A radius is this fraction of the diameter
1/2
Diameter = 12
37.68
radius = 5
area = 78.5
The name of this line, that touches the center and one side of the circle.
What is the radius?
A radius multiplied by this number gives you the diameter
2
A diameter of 26 is made of two radii, both of whih are this long
13
Radius = 4
25.12
diameter = 12
113.04
This word means the distance around a circle
What is the circumference?
This circle would have a diameter of what if the radius was 16.2
32.4
This radius times 2 gives you a diameter of 49.8
24.9
Radius = 42
263.76
Circumference = 46.7
Area = 173.63
In the wise words of Mufasa, "everywhere the light touches" can also be referring to this part of a circle (the space inside)
What is the area?
6
A circle with a circumference of 12.56 has a radius of...
2
This part of a circle is proportional to the circumference. (If the circumference gets bigger, that mean the ________ got bigger)
diameter
Circumference = 142.90
Area = 517.78
This delicious number is used only for circles and is infinitely long.
What is Pi?
A circle with an area of 254.34 has a diameter of...
18
This number squared and then times Pi gives you an area of 43.2
3.7
Area = 300 square cm, circumference = ?
61.38
What is the formula for area
A = 3.14 * r * r