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vocabulary
One-step Circumference
Two-step Circumference
radius/diameter
100

半径

radius

100

Find the circumference of a circle 

with a diameter of 70 cm.

Use Π=3.14

219.8 cm

100

Find the perimeter of a semicircle with a radius of 9 yd.

Use Π=3.14

46.26 yd

200

直径

diameter

200

Find the circumference of a circle with a radius of 32 yd.

Use Π=3.14

200.96 yd

200

Find the perimeter of a circle with a diameter of 46 ft.

Use Π=3.14

118.22 ft?

300

the perimeter of a circle

circumference

300

Find the circumference of a circle 

with a radius of 27 in.

Use Π=3.14

What is 169.56 in?

300

Find the perimeter of a circle with a radius of 32 in.

Use Π=3.14

164.48 in

300

The circumference of a circle is 251.2 in. 

Find the diameter.

Use Π=3.14

80 in

400

弦

chord

400

Find the circumference of a circle 

with a radius of 13 in.

Use Π=3.14

81.64 in

400

Find the perimeter of a circle with a diameter of 28 ft.

Use Π=3.14

71.96 ft?

400

The circumference of a circle is 188.4 in. 

Find the diameter.

Use Π=3.14

60 in

500

弧

arc

500

Find the perimeter of a semicircle with a radius of 18 cm.

Use Π=3.14

92.52 cm

500

The circumference of a circle is 157 in. 

The radius is？

Use Π=3.14

25 in