Circles: Radius, Diameter, and Circumference

Circle Terms

1

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

What is radius

2

The straight line passing through the center of a circle whose endpoints lie on the circle

What is the Diameter

3

The distance around a circle.

What is the circumference?

4

The total amount of space inside of a circle

What is the area?

5

3.14 or 22/7

What is pi?

Finding Radius(find the radius for all)

1

The diameter of this circle is 5

What is 2.5

2

The diameter is 12

What is 6

3

The diameter of this circle is 27

What is 13.5

4

The diameter of this circle is 437

What is 218.5?

5

The diameter of this circle is 0.325

What is 0.1625

Finding Diameter (Find Diameter for all)

1

The radius of this is 5

What is 10

2

The radius of this circle is 2.5

What is 5

3

The circumference of this circle is 15.7 (round to nearest whole number)

What is 5

4

The circumference of this circle is 18.84 (round to nearest whole number)

What is 6

5

The circumference of this circle is 194.68 (round to nearest whole number)

What is 62

Finding Circumference(Find Circumference for all)

1

The diameter for this circle is 10 (round 1dp)

What is 31.4

2

The diameter for this circle is 13 (round 2dp)

What is 40.84

3

The diameter of this circle is 25 (round 1dp)

What is 78.5

4

The radius for this circle is 45 (round 2dp)

What is 282.74

5

The radius for this circle is 1642 (round to nearest whole number)

What is 10,317

Finding Area(Find area for all)

1

The radius of this circle is 2 (round 2dp)

What is 12.57

2

The radius of this circle is 3 (round 2dp)

What is 28.27

3

The radius of this circle is 21 (round 1dp)

What is 1385.4

4

The diameter of this circle is 104 (round 2dp)

What is 8,494.87

5

The diameter of this circle is 401 (round to nearest whole number)

What is 126,293