Take out HW from last night.Take out HW from last night. Text p. 379, #1-6Text p. 379, #1-6

Copy HW in your planner.Copy HW in your planner. Text p. 390, #1-10 allText p. 390, #1-10 all

Complete the “Hands-On Lab Use Nets to Build Prisms and Cylinders” activity on page 386 in your textbook.

Do Now 5/9/13

“Net Activity” Complete the “Hands-On Lab Use Nets to

Build Prisms and Cylinders” activity on page 386 in your textbook.

Be sure to follow the directions exactly or your nets will not fit on the graph paper.

Graph paper, tape, and scissors are on the shelf. Be sure to be neat and clean up all of your scraps when you have finished.

Homework Text p. 379, #1-6Text p. 379, #1-6

1) D 2) circle 3) square 4) cylinder 5) cylinder 6)

Objective

SWBAT find the surface area of a prisms and cylinders

A A NETNET is a pattern that can be folded to is a pattern that can be folded to form a solid object like a prism or a pyramid.form a solid object like a prism or a pyramid.

4 in.4 in.

2 in.2 in.

10 in.10 in.

10 in.10 in.

2 in.2 in.

2 in.2 in.

4 in.4 in.

4 in.4 in.

Section 9.6 “Surface Area of Prisms and Cylinders”

Surface Area-Surface Area- the sum of the areas of all the the sum of the areas of all the faces of a polyhedron or solid faces of a polyhedron or solid figure.figure.

**HINT****HINT**To calculate surface area of a figure, To calculate surface area of a figure,

think of the net of the figure and think of the net of the figure and how many faces make up the figure. how many faces make up the figure.

Find the area of each face,Find the area of each face, and then add them all up!and then add them all up!

10 cm

5 cm5 cm

Find the surface area of Find the surface area of the rectangular prism.the rectangular prism.

Find the area of each face,Find the area of each face, and then add them all up!and then add them all up!

5 cm5 cm

10 cm10 cmSurface Area-Surface Area-the sum of the areas of all the the sum of the areas of all the faces of a faces of a polyhedron or solid figure.polyhedron or solid figure.

2 x (5)(5)2 x (5)(5)+ 4 x (5)(10)+ 4 x (5)(10)

Surface Area =Surface Area = 50 + 200 = 250cm50 + 200 = 250cm²²

25

25

50 50 50 50

10 cm

8 cm

15 cm

Find the surface area of Find the surface area of this triangular prism.this triangular prism.

3 cm

10cm10cm8cm8cm

15cm15cm

Surface Area = Surface Area = Triangle base = 12Triangle base = 12 Triangle base = 12Triangle base = 12 Left faceLeft face = 150= 150 Right faceRight face = 150= 150 BottomBottom = 120= 120

Surface Area = Surface Area =

444cm444cm²²

Surface Area-Surface Area-the sum of the areas of all the the sum of the areas of all the faces of a faces of a polyhedron or solid figure.polyhedron or solid figure.

12

12

150 120 150

10cm10cm

15cm15cm 15cm15cm

3cm3cm

Find the surface area of the prisms.

= 126

The surface area of the prism is 606 in2.

The surface area of the prism is 150 in2.

Front & back = 2 (9 x 7)

Top & bottom = 2 (7 x 15)

Left & right = 2 (9 x 15)

= 210

= 270

= 56Front = (8 x 7)

Top & bottom = 2(½ x 8 x 3)

Left & right = 2 (5 x 7)

= 24

= 70

Surface Area-Surface Area- the sum of the areas of the circular bases and the the sum of the areas of the circular bases and the lateral surface.lateral surface.

222 rrhSA Circular basesLateral surface

A A NETNET is a pattern that can be is a pattern that can be folded to form a solid object like a prism folded to form a solid object like a prism or a pyramid.or a pyramid.

222 rrhSA

Circular base

Lateral surface

Circular base

2 in2 in

4 in4 in

Find the surface area of a cylinder.

Surface Area = Surface Area =

Area of rectangle + 2 x Area of Area of rectangle + 2 x Area of circlecircle

222 rrhSA 2)2)(14.3(2)4)(2)(14.3(2 SA

12.2524.50 SA236.75 inSA

16 in16 in

22 in22 in

Find the surface area of a cylinder.

Surface Area = Surface Area =

Area of rectangle + 2 x Area of Area of rectangle + 2 x Area of circlecircle

222 rrhSA 2)8)(14.3(2)22)(8)(14.3(2 SA

92.40128.1105 SA220.1507 inSA

Homework Text p. 390, #1-11 allText p. 390, #1-11 all