Practice and Problem-Solving Exercises

A Practice

See Problems 1 and 2.

Find the area of each regular polygon. Round your answers to the nearest tenth.

6. octagon with side length 6 cm
7. decagon with side length 4 yd
8. pentagon with radius 3 ft
9. nonagon with radius 7 in.
10. dodecagon with radius 20 cm
11. 20-gon with radius 2 mm
12. 18-gon with perimeter 72 mm
13. 15-gon with perimeter 180 cm

See Problem 3.

Find the area of each triangle. Round your answers to the nearest tenth.

B Apply

20. PQRST is a regular pentagon with center O and radius 10 in. Find each measure. If necessary, round your answers to the nearest tenth.

    

    1. m ∠ P O Q m angle p o q
    2. m ∠ P O X m angle p o x
    3. OX
    4. PQ
    5. perimeter of PQRST
    6. area of PQRST

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