Circles, Circles, Circles!

Circle Terms

100

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

What is radius

200

The longest part in a circle. From one edge to the other through the center. 

Diameter

300

The distance around the circle.

Circumference

400

The total amount of space inside of a circle

Area

500

3.14159265359...

Pi

Finding Radius

100

Find the radius if the diameter of this circle is 5m

2.5m

200

Find the radius if the diameter is 12cm

6cm

300

Find the radius if the diameter of this circle is 27mm

13.5mm

400

Find the radius if the diameter of this circle is 437cm

218.5cm

500

Find the radius if the circumference is 25.12m

4m

Finding Diameter

100

Find the diameter when the radius is 5mm

10mm

200

Find the diameter when the radius is 2.5km

5km

300

Find the diameter when the radius of the circle is 15.7mm

31.4mm

400

Find diameter when the circumference of a circle is 18.84m

6m

500

Find the diameter when the circumference of a circle is 194.68cm

62cm

Finding Circumference

100

Find the circumference if diameter for this circle is 10m

31.4m

200

Find the circumference if the diameter for this circle is 13m

40.82m

300

Find the circumference if the diameter of this circle is 25cm

78.5cm

400

Find the circumference if the radius for this circle is 45mm

282.6mm

500

Find the circumference if the radius is 12.5mm

78.5mm

Finding Area

100

Find the area if the radius of this circle is 2cm

12.56cm

200

Find the area if the radius of this circle is 3km

28.26km

300

Find the area if the radius of this circle is 21mm

1384.74mm

400

Find the area if the diameter is 30cm

706.5cm

500

Find the area if the circumference is 25.12km

50.24km