GEO: 9-2 QC (reg polygons & circles)

1. Find the circumference of the circle.  

    Leave in terms of π.


 

8 ft

C=
π ft

2. Find the circumference of the circle.  

    Leave answer in terms of π.

 

3 cm
C=
π cm

3. Find the area of the circle.  Leave

    your answer in terms of π.


 

15in

A=
π in2

4. Find the area of the circle.  Leave 

    your answer in terms of π.

 

2.5m

A=
π m2

5. Find the circumference of the circle.  Leave

     your answer in terms of π.

 

2x in

C=
π in
6.  If the circumference of a circle is 20π      inches, what is the area of the circle?
400π sq inches
100π sq inches
20π sq inches
200π sq inches

7. Find the circumference of the circle.

    Round to the nearest tenth.

 

16cm

C=
cm

8. Find the measure of the central angle of

    a regular octagon.

degrees
Equilateral Triangle =

9. Match the measure of a central angle with the 

    correct regular polygon below.

Pentagon =
Hexagon =
Square = 
90o
?
120o
?
72o
?
60o
?

10. Find the apothem of the regular hexagon

      below if it has a side length of 6 cm.

      Round to the nearest tenth.

apothem =
11. Find the area of a regular pentagon with       side lengths 6 ft. (nearest tenth)
Area = 
ft2
12. Find the area of a regular hexagon with       side lengths 20 ft.       Round to the nearest tenth.
Area = 
ft2

13. Find the area of a regular pentagon if it has

     a side length of 7 inches and an apothem of

     length 4.5 inches.  (nearest hundredth)

square inches

14. Find the apothem of a regular nonagon

      with side lengths 12 ft. 

      Round to the nearest tenth.

ft

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