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Class
Date
10.5 – PRACTICE PROBLEMS
Find the area of each regular polygon. Round your answers to the nearest tenth.
1. pentagon with side length 8 in.
2. hexagon with side length 9 m
3. decagon with radius 4 mm
4. octagon with radius 10 cm
5. 20-gon with radius 5 in.
6. 15-gon with perimeter 90 ft
7. 18-gon with perimeter 126 m
Find the area of each triangle. Round your answers to the nearest tenth.
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13. ABCDEFGH is a regular octagon with center X and radius 5 cm.
Find each measure to the nearest tenth.
a. mFXE
b. mYXE
c. XY
d. FE
e. perimeter of ABCDEFGH
f. area of ABCDEFGH
Find the perimeter and area of each regular polygon to the nearest tenth.
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