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 line that goes all the way through the circle from the middle

Diameter

300

What is the area formula for a circle?

pi *r²

400

What is the formula for the circumference of a circle?

2*pi*r

500

What is 3.14?

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

5

400

The circumference of this circle is 18.84

6

500

The diameter of this circle is 194.68

62

Finding Circumference(Find Circumference for all)

100

The diameter for this circle is 10. Find the CIRCUMFERENCE.

31.4

200

The diameter for this circle is 13. Find the CIRCUMFERENCE.

40.82

300

The diameter of this circle is 25. Find the CIRCUMFERENCE.

78.5

400

The radius for this circle is 45. Find the circumference.

282.6

500

The Diameter for this circle is 3285. Find the circumference.

10314.9

Finding Area(Find area for all)

100

The radius of this circle is 2. Find the AREA.

12.56

200

The radius of this circle is 3. Find the area.

28.26

300

The radius of this circle is 21. Find the area.

1384.74

400

The radius of this circle is 52.4. Find the AREA.

8621.6864

500

The radius of this circle is 6955. Find the AREA.

151888158.5