Circles: Radius, Diameter, and Circumference

Circle Terms

100

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

What is radius

200

A line that stretches across a circle from one point to another through the center.

What is the Diameter

300

The distance around a circle

What is a circumference?

400

The total amount of space inside of a circle

What is the area?

500

3.14 or 22/7

What is pi?

Finding Radius(find the radius for all)

100

The Diameter of this circle is 5units

What is 2.5units

200

The diameter is 12cm

What is 6cm

300

The diameter of this circle is 2ft

What is 1ft

400

The diameter of this circle is 437cm

What is 218.5cm

500

The area of this circle is 50.24in²

What is 4in

Finding Diameter (Find Diameter for all)

100

The radius of this is 5m

What is 10m

200

The radius of this circle is 2.5in

What is 5in

300

The circumference of this circle is 15.7cm

What is 5cm

400

The circumference of this circle is 18.84cm

What is 6cm

500

The circumference of this circle is 194.68mm

What is 62mm

Finding Circumference(Find Circumference for all)

100

The diameter for this circle is 10mi

What is 31.4mi

200

The diameter for this circle is 13in

What is 40.82in

300

The diameter of this circle is 25mm

What is 78.5mm

400

The radius for this circle is 45ft

What is 282.6ft

500

The Diameter for this circle is 3285 m

What is 10314.9m

Finding Area(Find area for all)

100

The radius of this circle is 2cm

What is 12.56 cm²

200

The radius of this circle is 3 in

What is 28.26 in²

300

The radius of this circle is 21mm

What is 1384.74 mm²

400

The radius of this circle is 52.4cm

What is 8621.6864 cm²

500

The radius of this circle is 6955 ft

What is 151,888,158.5 ft²