7th Grade Math

C 23. FIND THE ERROR Aisha is finding the volume of rice that will fill a

cone-shaped decorative vase. The vase is 6 inches tall with a 4-inch

diameter. Find her mistake and correct it.

24. OPEN ENDED Draw and label two cones with different dimensions but
    the same volume.


25. REASONING Which would have a greater effect on the volume of a cone:
    doubling its radius or doubling its height? Explain.


26. E WRITE MATH Dario and Divya are simplifying π · 52. Dario rounds
    π to 3.14 and Divya uses the π key on her calculator. Which student’s
    calculation is closer to the exact value? Why? y

Test PracticeT

578 Volume and Surface Area

V = _^1

3

πr^2 h

V = _^1

3

π • 4 • 4 • 6

V ≈ 100.5 in^3

Find the volume of each pyramid. Round to the nearest tenth. (Lesson 1E)

29.

2.4 in.

1.9 in.

2.3 in.

30.

12 ft

5 ft

11 ft

31. Find the volume of a cylinder with a radius of 2.9 meters and a height of
    4.9 meters. Round to the nearest tenth. (Lesson 1C)


32. Which is closest to the volume of the
    cone shown?
    A. 564.4 cm^3
    B. 666.7 cm^3
    C. 886.5 cm^3
    D. 1,238.2 cm^3

7 cm

11 cm 13 cm

28. Which is closest to

5 in.

3 in.

the volume of ice

cream that the cone

can hold?

F. 47.1 in^3

G. 23.55 in^3

H. 15.7 in^3

I. 11.8 in^3

569_578_C10_L1_895130.indd 578 1/4/10 2:38 PM