Geometry B, Assignment 10. Circles: Circumference and PI

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Which regular polygon with an apothem of 5 inches, will have a perimeter that is closest to the circumference of a circle with a diameter of 10.8 inches?

Octagon

Find the exact circumference of a circle with the given radius. 5 inches C =

10 π in.

Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more decimal than in the given radius. 4 inches C =

25.1 inches

Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more decimal than in the given radius. 4.6 inches C =

28.89 in.

Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more decimal than in the given radius. 6 ft. C =

37.7 feet

If the radius of a circle is doubled in length, the circumference of the circle is:

Doubled

Find the exact circumference of a circle with the given radius. x/2 miles C =

x π miles

Find the exact circumference of a circle with the given radius. 7 feet C =

14 π ft.

Find the value of the circumference of a circle with the given diameter. 3.21 ft. C =

3.21 π

Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more decimal than in the given radius. 5.1 cm C =

32.03 cm

Find the radius of a circle with the given circumference. 6√2 π in. r =

3√2 in.

Find the radius of a circle with the given circumference. 12π in. r =

6 inches

Find the exact circumference of a circle with the given radius. 3¼ inches C =

6.5 π in.

Find the exact circumference of a circle with the given radius. 3½ cm C =

7 π cm

Find the radius of a circle with the given circumference. 15π ft. r =

7.5 ft.

Find the exact circumference of a circle with the given radius. 36 inches C =

72 π in.

In the formula C = 2r , C stands for:

Circumference


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