6th Grade Math Textbook, Fundamentals

d  7.6 cm

h  27.5 cm

Lesson 11-6 for exercise sets. &KDSWHU 

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Estimate the surface area for each solid to the nearest whole unit.

7.Discuss and Write Explain how you could express your answer to exercise 5 to

the nearest square yard. Show the steps to support your explanation.

1124.1 mm

10.3 mm

13.6 ft

31.9 cm 0.7 ft

94.3 cm

1.98 ft

1.98 ft

1.98 ft

2.12 cm

3.5 cm

0.3 cm

17.5 in.

10.68 in.

6 in.

18.5 in.

José wants to paint the entire surface of a solid metal rod.

About how many square centimeters does he need to cover

the rod with paint?

To find about how many square centimeters, estimate the

surface area of the rod (a cylinder).

To estimate the surface area, round each measurement

to the nearest whole number. Then compute.

1

Round each dimension to the nearest

whole number.

diameter 7.6 cm 8 cm

height 27.5 cm 28 cm

Estimate the area of the circular base.

Ar^2

A3(4^2 )

A48 cm^2

Estimate the total surface area.

S 2 r^2  2 rh

S2(48)  672

768 cm^2

José needs about 768 cm^2 of paint to cover the rod.

First estimate the radius.

r r4 cm

Estimate the lateral area.

Lateral Area  2 rh

2(3)(4)(28)

672 cm^2

8

2

d

2

Think

3.14  3