7th Grade Math

Extra Practice EP29

Extra Practice

Multi-Part Lesson 10-2: Surface Area

PARTS A B PAGES 580–587

Find the surface area of each rectangular prism. Round to the nearest tenth

if necessary.

15 cm

4 cm4 cm

27 yd

16 yd

10 yd

4 in.

6 in.

7 in.

18 in.

32 in.

10 in.

5. length = 10 m 6. length = 20 mm 7. length = 8 ft
   width = 6 m width = 15 mm width = 6.5 ft
   height = 7 m height = 25 mm height = 7 ft


6. length = 20.4 cm 9. length = 8.5 mi 10. length = 7 ^14 ft
   width = 15.5 cm width = 3 mi width = 5 ft
   height = 8.8 cm height = 5.8 mi height = 6 ^12 ft


7. length = 15 ^23 yd 12. length = 4 ^12 in. 13. length = 12.2 mm
   width = 7 ^13 yd width = 10 in. width = 7.4 mm
   height = 9 yd height = 8 ^34 in. height = 7.4 mm


8. Find the surface area of an open-top box with a length of 18 yards,
   a width of 11 yards, and a height of 14 yards.


9. Find the surface area of a rectangular prism with a length of 1 yard,
   a width of 7 feet, and a height of 2 yards.

PARTS C D PAGES 588–593

Find the surface area of each cylinder. Round to the nearest tenth if necessary.

1. 3 in.

7 in.

2. 6.5 cm

2 cm

3.

1.5 m

6 m

4.

5ft^34

(^12) ft

5. height = 6 cm 6. height = 16.5 mm 7. height = 22 yd
   radius = 3.5 cm diameter = 18 mm radius = 10.5 yd


6. height = 10.2 mi 9. height = 8.6 cm 10. height = 32.7 m
   diameter = 4 mi diameter = 8.2 cm radius = 21.5 m


7. height = 2 ^2
   3
   yd 12. height = 12 ^3
   4
   ft 13. height = 5 ^1
   2
   in.
   diameter = 6 yd radius = 7 ^1
   4
   ft diameter = 3 in.

EP2_EP36_ExtPract_M1_895130.indd EP29 1/6/10 11:46 AM