Circles: Radius, Diameter, and Circumference

Circle Terms

100

The distance from the center of a circle to the outside, also half of the diameter

Radius

200

The distance across the circle through its center

The Diameter

300

The diameter is _____ as long as the radius

twice

400

The total amount of space inside of a circle

The area

500

3.14 or 22/7 are approximations for...

Pi

Finding Radius(find the radius for all)

100

The Diameter of this circle is 5

2.5

200

The diameter is 12

6

300

The diameter of this circle is 27

13.5

400

The diameter of this circle is 437

218.5?

500

The diameter of this circle is 0.325

0.1625

Finding Diameter (Find Diameter for all)

100

The radius of this is 5

10

200

The radius of this circle is 2.5

5

300

The circumference of this circle is 15.7

(Think about the formula for finding circumference... how could you use it to find the diameter?)

5

400

The circumference of this circle is 18.84

 6

500

The circumference of this circle is 194.68

62

Finding Circumference(Find Circumference for all)

100

The diameter for this circle is 10

31.4

200

The diameter for this circle is 13

40.82

300

The diameter of this circle is 25

78.5

400

The radius for this circle is 45

282.6

500

The diameter for this circle is 3,285

What is 10,314.9

Finding Area(Find area for all)

100

The radius of this circle is 2

12.56

200

The radius of this circle is 3

28.26

300

The radius of this circle is 21

1384.74

400

The radius of this circle is 52.4

8621.6864

500

The diameter of this circle is 13,910

151,888,158