7th Grade Math

18 Start Smart

Find the perimeter of each figure.

5. rectangle with a length of 3.25 inches and a width of 2 inches


6. triangle with side lengths of 4 centimeters, 7 centimeters, and
   5 centimeters


7. parallelogram with side lengths of 5 meters, 3 meters, 5 meters, and
   3 meters


8. square with a side length of 12 feet


9. PHOTOGRAPHY The mat of a photograph is 17 inches long and 12 inches
   wide. What is the perimeter of the mat?


10. HOME IMPROVEMENT Caitlyn wants

12 ft

15 ft

10 ft

4 ft

5 ft

18 ft

to put a wallpaper border around

the ceiling of her bedroom. Find the

perimeter of Caitlyn’s bedroom to

determine how many feet of

wallpaper border she will need.

Find the missing measure in each figure.

11. P = 14 in. 12. P = 30 cm
    5 in.

? in.

5 cm

? cm

13 cm

13. P = 16 m 14. P = 10 in.

5 m

? m

4 m

5 m

2.5 in.? in.

2.5 in. 2.5 in.

15. TRAFFIC SIGNS A regular octagon has 8 equal sides. The perimeter of a
    traffic sign in the shape of a regular octagon is 96 inches. What is the
    length of one side?


16. JOGGING Ramón jogged along the perimeter of a rectangular
    campground. He jogged 6 miles north, 5 miles east, and 6 miles south. If
    he jogged a total of 22 miles, how many miles did he jog west?


17. SCHOOL A rectangular bulletin board is 36 inches long and 24 inches
    wide. How much border does it take to decorate the perimeter of the
    bulletin board?

Real-World Link

Commonly seen

traffic signs are

different colors

and shapes

so drivers

immediately

know their

meanings.

RRRRRRRRR

C

002_021_C00_SS_895130.indd 18 1/4/10 2:24 PM