Chapter 9.1-9.2

Radius

100

If the diameter is 40cm what is the radius?

20cm

200

If the diameter is 5m what is the radius?

2.5m

300

If the diameter is 1.5in what is the radius?

0.75in

400

If the diameter is 212 what is the radius?

101 units

500

If the diameter is 20.75cm what is the radius?

10.375cm

Diameter

100

If the radius is 40cm what is the diameter?

80cm

200

If the radius is 3.5in what is the diameter?

7in

300

If the radius is 15m what is the diameter?

30m

400

If the radius is 115 what is the diameter?

230 units

500

If the radius is 0.85cm what is the diameter?

1.7cm

Circumference

100

Find Circumference: The radius is 3ft.

18.84ft

200

Find Circumference: The diameter is 14m.

44m

300

Find Circumference: The diameter is 16ft.

50.24ft

400

Find Circumference: The radius is 7.5in.

47.1in

500

Find Circumference: The radius is 42m.

264m

Area

100

Find the Area: The radius of the circle is 5m.

78.5m^2

200

Find the Area: The radius of the circle is 50mm.

7850mm^2

300

Find the Area: The diameter of the circle is 40in.

1256in^2

400

Find the Area: The diameter of the circle is 7ft.

38.465ft^2

500

Find the Area: The radius of the circle is 21mm.

1386mm^2

Semi-Circles

100

Find the perimeter of a semicircle with a diameter of 28yds.

about 72 yds

200

Find the perimeter of a semicircle with a radius of 7.5ft.

about 38.55ft

300

Find the perimeter of a semicircle with a diameter of 11cm.

about 28.27cm

400

Find the area of a semi-circle with a diameter of 20in.

about 157in²

500

Find the area of a semi-circle with a radius of 21ft.

about 693ft²